1. RV Air Conditioners
  2. Advent Air
  3. 13500 Btu
  4. With Heat Strip
  5. System w Ceiling Assembly
  6. System w Thermostat
Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip - 13,500 Btu

Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip - 13,500 Btu

Item # ACM135CH
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Our Price: $745.75
RV Air Conditioners
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Shipping Weight: 93 lbs
Advent Air RV Air Conditioners - ACM135CH
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Ductless AC unit lets you replace an existing AC or add a new AC to your RV. The air distribution box has a built-in thermostat, the start capacitor jumpstarts the AC when you need a boost, and the electric heat strip keeps you warm on cold mornings. Lowest Prices for the best rv air conditioners from Advent Air. Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip - 13,500 Btu part number ACM135CH can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (120)
  • Q & A (44)
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Advent Air RV Air Conditioners - ACM135CH

  • 13500 Btu
  • With Heat Strip
  • Advent Air
  • System w Ceiling Assembly
  • System w Thermostat
  • Medium Profile

Ductless AC unit lets you replace an existing AC or add a new AC to your RV. The air distribution box has a built-in thermostat, the start capacitor jumpstarts the AC when you need a boost, and the electric heat strip keeps you warm on cold mornings.


  • Air conditioner quickly and efficiently cools the interior of your RV or camper
    • Replaces, upgrades, or adds an air conditioner and air distribution box
    • Compatible with only ductless systems
  • 6-Blade fan with motor has 3 speed settings for increasing or decreasing airflow
  • Air distribution box has adjustable registers on the front and back that let you direct the air where needed
    • Internal aluminum components are rustproof
  • Built-in thermostat controls the fan and temperature settings
  • Start capacitor jumpstarts the AC when a campsite or generator doesn't provide enough power
    • Stores energy that will later be used for the next startup
  • Electric heat strip removes the chill on cold or frosty mornings
    • Easy plug-and-play installation with included 30" power cord
  • Thick, collapsible gasket with 6 foam pads provide support between RV roof and air conditioner
    • Gasket seals the opening to prevent water seepage and air leaks
    • Foam pads help reduce noise
  • Removable air filter prevents dust and dirt build-up on the fan blades
  • White, hard plastic cover protects internal components from water and debris
    • Can easily be removed for maintenance and cleaning
  • Bolt-on installation
    • Includes wiring harness and mounting hardware
  • UL and cUL certified


  • Fits: roofs 2-1/2" to 5" thick
    • Opening size: 14-1/4" long x 14-1/4" wide
  • Air conditioner power draw (while running): 15 amps
  • Compressor power draw (while running): 9.9 amps
  • Fan motor power draw (while running): 2.6 amps
  • Capacity:
    • Cooling: 13,500 Btu per hour
    • Heating: 5,500 Btu per hour
  • Electrical rating: 115V, 60Hz
  • Air flow: 500 cubic feet/minute
  • Thermostat temperature range: 65 F to 90 F (16 C to 30 C)
  • Overall dimensions:
    • Air conditioner: 31-3/16" long x 24-7/8" wide x 12-13/16" tall
    • Air distribution box: 22-1/2" long x 21-1/2" wide x 3-1/2" tall
    • Start capacitor: 2-1/8" long x 3-5/8" deep x 6-5/16" tall
    • Heat strip: 15-3/4" long x 2-3/4" tall x 4-3/4" tall
  • Refrigerant: R410a, 16.9 oz
  • Wire gauge: 12 AWG
  • Air conditioner weight: 68 lbs
  • 2-Year warranty

This Advent Air AC unit lets you replace an existing, old or broken air conditioner or add a new air conditioner to an area on your RV or camper that doesn't already have one. The AC has a powerful fan and motor that provides a steady stream of air to efficiently cool the inside of your RV on a hot or muggy day. For your convenience, the included air distribution box has a built-in thermostat that lets you set the fan speed and temperature. It also operates the electric heat strip, which helps keep you warm on a cold morning. The included start capacitor will help jumpstart the AC. This beneficial upgrade provides the AC a boost when shore power or generator power isn't enough to start it. And everything you need in order to replace or add an AC unit is included, which makes installation simple and easy.

Air Distribution Box and Thermostat

Advent Air Air Distribution Box

The AC unit includes an air distribution box with a built-in thermostat. The dial on the left controls the 3 fan speed settings, which let you increase or decrease the airflow. It also controls the 3 cool settings and the heat setting. The dial on the right allows you to set the temperature. Additionally, there are adjustable registers on the front and back of the box. These can be tilted up, down, or side-to-side for directing the air where needed. The removable air filter prevents dust and dirt from building up on the fan blades.

Start Capacitor

Advent Air Start Capacitor

If your campsite or generator isn't able to draw the power you need, then you may have difficulty starting your AC unit. The included start capacitor, however, can eliminate this problem. The capacitor stores energy that will later be used to jumpstart the AC. Once the sufficient amount of power has been supplied to the AC, the compressor will start to run, and the internal relay switch will turn the start capacitor off. At the same time, the compressor will send "back voltage" to the relay switch and capacitor in order to energize them for the next startup.

Electric Heat Strip

Advent Air Electric Heat Strip

The electric heat strip keeps your RV warm on a cold or frosty morning. It is operated with the control dial on the air distribution box. After you turn the dial to the OPT. HEAT setting, the compressor will shut off, and the fan will blow air over the heater and into your RV. When the optimal temperature has been reached, turn the dial to a fan or cooling setting. Please also note that the heat strip only has one temperature setting and cannot be controlled by the thermostat.

Simple Installation

Advent Air AC Installation 13,500 BTU

Because your RV is likely already prepped and pre-wired for an AC unit, installation is simple and easy. Most AC units, including this one, are designed to fit an opening that measures 14-1/4" x 14-1/4". Depending on your roof setup, you may need to do minimal alterations. If the opening is larger than 14-3/8" x 14-3/8", you will need to install spacers between the sides of the unit and the opening's edges. If the opening is smaller than 14-1/8" x 14-1/8", you will need to enlarge the hole to fit the unit snugly inside the opening.

Advent Air AC Collapsible Gasket and Foam Pads

On the bottom of the AC, there's a thick, collapsible gasket with 6 noise-reducing foam pads. This provides support between the RV roof and AC and seals the opening to prevent water and outside air from leaking in. Because of this, the use of fresh sealant isn't required during installation.

To install the start capacitor, bolt it to the fan motor support with the included hardware and then route the wires to the run capacitor.

To install the heat strip, mount it to the evaporator inside the AC unit with the included mounting screws. The heat strip has easy, plug-and-play installation with the supplied 30" power cord. Please note that the heat strip should be installed before the air distribution box is installed.

Once installed, the hard plastic cover on the AC can easily be removed for maintenance and cleaning.

ACM135 Advent Air RV Roof Air Conditioner - 13,500 Btu - White

ACDB Advent Air RV Plenum for Air Conditioners - White

ACMSCKIT Advent Air Start Capacitor for RV Air Conditioners

ACMHD Advent Air Electric Heat Strip for RV Air Conditioners - 5,500 Btu

Installation Details ACM135CH Installation instructions

California residents: click here

Customer Reviews

Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip - 13,500 Btu - ACM135CH

Average Customer Rating:  4.8 out of 5 stars   (120 Customer Reviews)

Ductless AC unit lets you replace an existing AC or add a new AC to your RV. The air distribution box has a built-in thermostat, the start capacitor jumpstarts the AC when you need a boost, and the electric heat strip keeps you warm on cold mornings.

- ACM135CH

As with other orders, the generator showed up on time and in good shape. The etrailer videos were very clear as to remove the old AC and replace it with the new Advent unit. The etrailer videos also showed to install the capacitor, the heat strip, and the distribution box. We were worried about getting the unit on the roof of the camper however it really was not a problem ….. we leaned a ladder up against the camper, tied a rope around the box, then leaned the box against the ladder. One person got on the roof and pulled the rope while two more people pushed from below... no problems and in about a minute the box was on the roof. The unit is now installed and looks good …. no power at the storage yard so I can only assume that the unit works as it is supposed to (like ever thing else we have ever ordered from etrailer). Good Job guys! 644424

AC has worked flawlessly would recommend the AC unit and Etrailer
William - 05/22/2020


- ACM135CH

I'm planning on using my trailer as a workshop so heat and AC were important. This AC unit was easy to install into the existing 14x14 vent. Took me about an hour to install and everything went smoothly. My trailer is 28 ft long so I'm thinking that I'll be needing a 2nd unit at the far end. I'll decide that after I'm finished insulating the walls. I've already put in 2 inches of rigid foam on the roof and that alone made a huge difference. 655942

AC works well but I recently upgraded this unit to the remote thermostat so that I would have more precise temperature control. Upgrading was easy just bought the part from etrailer and installed. I definitely do need a 2nd unit which I hope to do soon.
DrPcFix - 06/11/2020


- ACM135CH

Thanks to Covid, I was only able to use it once this year but the air unit performed perfectly. 932088

- ACM135CH

Air conditioner was a breeze to install, as were the heat strip and the capacitor. This setup does run off a 2000 watt generator as I hoped. Have not used the heat strip as of this posting. 872558

- ACM135CH

The air conditioner actually came sooner than I thought it would and was easy to install in the place of the vent. The manufacturer needs to put directions in for installing the optional heater strips since there were none included in the package. I had to look it up online. 866189

- ACM135CH

Installed on used short school bus, partially converted to an RV. The unit was relatively easy to install. It looks good and runs great, however I should have bought a larger unit. The interior of the bus is approximately 150 square feet so I thought 13500 btu would be more than adequate. While it does not quite keep up with this Louisiana heat, it is much better with it than without. The bus did not come with factory ac, so I installed a generator on the bus so I can run the unit while driving. 799194

- ACM135CH

Everything worked great. Install was easy replacing a vent on my trailer. One problem was that the knob won’t stay put on the control. Never worked. It barely grips the post and falls off after the unit starts running for only a few minutes. So far it hasn’t dropped into my coffee so that’s good. Unit functions just fine though. I like the start capacitor as it can run on most lower amp services at campgrounds and in my driveway on a regular ext cord. 799051

- ACM135CH

Haven't installed yet so can't comment on product. But ordering & delivery experience was very good. Delivered on time & in good condition. 789874

- ACM135CH

I found exactly what I was looking for right away. The website was easy to use and had free shipping. The items arrived in a few days. I haven't had a chance to go through everything yet but I am extremely happy with etrailer.com. Thanks for the great service! 786896

- ACM135CH

Being from Hawaii could have is disadvantages when trying to get items shipped here. Thanks to Dena from etrailer my customer as well as myself are very happy. My customer was specific to what type of product they wanted because they were very pleased with it in the past and gave me the task of finding it and getting it shipped here. After a few failed attempts from other vendors Dena not only came through for me but expedited my shipment and saved me close to $500.00 in air freight charges. Thank you Dena and her team for the great service!!. I look forward to doing business with etrailer in the future. 707862

- ACM135CH

Great response time . Haven't installed yet but it appears to be in perfect condition. 642380

- ACM135CH

arrived quickly 589818

- ACM135CH

The order came in super quick. I can't report on performance of the roof top ac or fan yet, as my rv isn't ready for them yet. It they work half as good as delivery, I know they will be great. 574262

- ACCOL135

Review from a similar AC Unit in RV Air Conditioners

Ahoy folks. Yelp I ordered and received ACCOL135 unit. designed to replace a Coleman unit. product was delivered from out of state, right on time!! very cost effective. easy installation. preformes as advertised. longevity undetermined? 602553

- ACCAR150

Review from a similar AC Unit in RV Air Conditioners

Received Advent Air Replacement Rooftop RV Air Conditioner for Carrier Setup 15,000 Btu White- ACCAR150 in excellent condition by UPS. Replaced one of my old Carrier Air V air conditioners on my 32' Damon Daybreak motor home. It was easy to install and the conversion kit that came with it worked very well. Quiet even when running on high speed. Used the same remote and ceiling mount I had with my Carrier Air Conditioner. 528083

- ACM150

Review from a similar AC Unit in RV Air Conditioners

I am surprised by the missing inside grill cover. I thought the AC unit would come with a new trim cover for the inside. I used the old one and it doesn’t fit correctly so it’s just hanging there. Does this AC not come with a trim cover for the inside? 765183

This unit does not come with the Air Distribution Box included with the Air Conditioner. If you were looking for a unit with the air distribution, part # ACM150C
Advent Air RV Air Conditioner w/ Air Distribution Box and Start Capacitor - 15,000 Btu - White
comes with the Air Distribution Box. Advent Air does sell the boxes separately depending on what type of thermostat you have. Part # ACRG15
Air Distribution Box w/ Wall-Mounted Thermostat for Advent Air RV Air Conditioners - White
is for wall-mounted thermostats. Part # ACDB
Air Distribution Box w/ Built-In Thermostat for Advent Air RV Air Conditioners - White
is for unites with built in thermostats.
-- Tyler M - 03/12/2020


- ACM135C

Review from a similar AC Unit in RV Air Conditioners

I’ve had the advent ac unit for a year now and love it . Our fifth wheel was preprep for the second ac unit so it was simple to install. We use it mostly to cool the rig down after set up and on those hot humid nights or when the outside temps shot up in the afternoons . But yes I would recommend this unit . In fact if the need would ever arise I’m would order the direct replacement for the factory installed Dometic unit on the rear . Shipping was fast with no damage. 664585

- ACM135BC

Review from a similar AC Unit in RV Air Conditioners

My husband installed this as a second air conditioner in our 5th wheel. Installation took a little longer than expected due to getting the inside template to line up with the main unit. Also, it is pretty noisy on medium and high; however, that doesn’t bother us as we like to sleep with “white noise”. Overall, it cools well and is a fairly straightforward installation with minor adjustments needed. If you are mechanically inclined, installation should not be an issue. 647387

- ACM135BC

Review from a similar AC Unit in RV Air Conditioners

My review is on Lori at etrailer, when I ordered my advent a/c unit I knew it would not be available for 6 to 8 weeks,she kept me informed & when they received a shipment let me know, delivery was quick. Thank you Lori for keeping me informed . Due to travel I won't be installing the unit till spring so I can't review it at this time. I have bought from etrailer in the past & will again in the future, Great job. 572881

- ACM135

Review from a similar AC Unit in RV Air Conditioners

Delivery guy left box on it’s side, I opened box and found and small crack on the rear upper corner was cracked. Other than that I hooked it up and it works great. 646643

- ACM150

Review from a similar AC Unit in RV Air Conditioners

I bought this for a 1983 ford shasta r/v Took about 1 1/2 hours to install. would have been less time but I had to reroute the 12/2/ rx to the other side. Was very easy to install. So next time I hit a very low tree branch and rip off my a/c unit I will get another one here!!! 489289

- ACCOL135

Review from a similar AC Unit in RV Air Conditioners

The unit seems to be a top of the line quality product. Installation was fairly straight forward except the instructions are outdated. Instructions tell you to remove the receiver cover to prep it for mounting the Coleman control panel. The cover is not removable, it's now a high density foam. Also the supplied hardware is not long enough to go through the cover. The photos in the instructions are very hard to determine what they are of. 510096

Labor Day weekend 2018 we were camping at a site in direct sunlight. While running the unit on high we experienced a smell of something electrical over heating. I feel that the compressor failed. I have been in touch with the company and have the location of the nearest service location but have not been able to take the RV there yet. There is a 2 year warrantee so it shouldnt be a problem just an inconvenience.
Michael w - 05/19/2019


- ACCOL150

Review from a similar AC Unit in RV Air Conditioners

This unit can't be beat if you are replacing a stock Coleman--Avery straightforward installation. Airflow is better than my old Coleman but temperature is not. I've taken 3 trips with this Advent on Summer days with temperatures in the 90s, and in all cases the output temperature never got cooler than 60. The old Coleman could blow 50 degrees. 551026

Where are you measuring the 60°? According to the manufacturer, ASA Electronics, if your trailer has a ducted system, its possible that theres a leak in the ductwork. The best way to rule out the AC unit itself is to measure the output air temperature right as it leaves the unit.
-- Mike L - 01/24/2019


- ACM150

Review from a similar AC Unit in RV Air Conditioners

Very fast delivery at a very good price. 481836

- ACDOM150

Review from a similar AC Unit in RV Air Conditioners

I just finished installing a/c unit. Exactly as advertised direct replacement plug and play. 912819

Show More Reviews

Ask the Experts about this Advent Air RV Air Conditioners

  • Could Solar Panels Power Advent AC Unit on RV
    If the solar panel could provide 15 amps of 12 volt power the Advent Air RV Air Conditioner # ACM135CH could be ran off of it. Since solar panel as a direct power source can fluctuate depending on access to sunlight it's not the wisest to run it straight off of a solar panel and instead having a battery bank get charged from the panel which then provides the power for the AC unit. Or use a generator like # 333-0003. For a panel setup that has the amperage you'd need we have the part...
    view full answer...
  • Best Value Air Conditioner To Replace Coleman Mach Air Condtioner on Fleetwood Trailer
    The Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip part # ACM135CH may not be your best option depending on your situation. I recommend to use Advent Air Replacement RV Air Conditioner for Coleman Setup w/ Start Capacitor part # ACCOL135 which is designed to replace Coleman Mach air conditioners that have air distribution boxes (for RVs without air ducts) and/or thermostats that are still in good working order. The replacement air conditioner for...
    view full answer...
  • Does ACM135CH Come With Air Distribution Box
    I can confirm for you that the Advent Air RV Air Conditioner with Air Distribution Box, Start Capacitor, and Heat Strip - 13,500 Btu - White # ACM135CH and Black # ACM135BCH do indeed come with the air distribution box, so it is a complete unit. The review you are referencing was for a different Advent part number that was the AC unit only. That review is on the product page like you mentioned, which is something we do that so customers can get a good sense of how these units perform overall. So...
    view full answer...
  • Wattage for Advent Air Rooftop RV Air Conditioner
    The Advent Air Rooftop RV Air Conditioner w/ Vent, Start Capacitor, and Heat Strip # ACM135CH draws 1,450 watts; it is a 13,500 Btu per hour unit that has enough capacity for 550 square feet, conservatively.
    view full answer...
  • Generator Requirements for Advent RV AC Unit part # ACM135CH
    The Advent RV AC Unit part # ACM135CH that you referenced draws 1,450 watts so that would be basically the minimum wattage required for just it. The closest generator that Champion offers (a brand we don't carry) is 2,000 watts. The most similar generator we have would be the A-iPower 2,000 Watt Generator part # 289-SUA2000I. This is a really great generator that is similar in price as the Champion and is a favorite among our customers! I attached a review video for it for you to check...
    view full answer...
  • RV Air Conditioner Unit for 2019 250 Ram Pro Master Converted to Camper Van
    13,500 btu AC unit like the # ACM135CH won't be overkill to the point of being a problem for your 2019 250 Ram Pro Master cargo van that you plan to convert to a camper van. This size AC unit is recommended for smaller sized campers which wouldn't be that much larger than what your setup will be. This means the unit will easily covering your cooling needs.
    view full answer...
  • A/C Unit Recommendation for my Enclosed Trailer With Heat Strip
    Of course! We have two really good options for you which both come if white or black. The first is the Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip - 13,500 Btu part # ACM135CH for white or part # ACM135BCH for black. The second option is more pewerful. The Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip - 15,000 Btu part # ACM150CH for white or part # ACM150BCH for black. Both of these are good units that...
    view full answer...
  • Does The Advent Air Conditioner Have A Thermostat and Can I Power it With My Champion Generator
    Yes, The Advent Air Rv Air Conditioner part # ACM135CH does come with a built-in thermostat that controls the fan setting and temperature of the air conditioner. The Champion generator you referenced features 3400 starting watts and 3100 running watts. The air conditioner uses 1450 starting and running watts so the generator is more than sufficient to power the air conditioner.
    view full answer...
  • Does Atwood Air Command Rooftop RV Air Conditioner AT15025-21 have a Heat Strip Option
    I did not find anything alluding to the use of heat strips for the Atwood Air Command Rooftop RV Air Conditioner AT15025-21 which has been discontinued. The Advent Air options, # ACM150CH and # ACM135CH, come with a heat strip. This company was recently here for training and I was impressed with how well made their products are; far better than other more well known manufacturers I have seen.
    view full answer...
  • AC Unit Recommendation for Enclosed Race Trailer
    I prefer the Furrion AC units over the Advent Air ones as they tend to blow colder air. For a single unit I'd go with the 15.5k BTU part # FACR15SA-BL which is for non-ducted applications like your enclosed trailer.
    view full answer...
  • Can Non-Ducted AC Unit be Replaced with Ducted AC in RV
    Your RV would need to have ducts installed in the roof as well as vents elsewhere. There really isn't a great way to install ducted AC unit in a trailer that does not have them. That's why they make ductless AC units like the # ACM135CH which does have a heat pump like you mentioned wanting as well.
    view full answer...
  • What Size Hole Opening is Required for the Advent Air RV Air Conditioner
    If you currently have a Fan-Tastic Vent Roof like part # FV801250 then the Advent Air Rooftop RV Air Conditioner # ACM135CH will fit perfectly in its place. It fits in standard roof openings which is what you would have already for your Fa-Tastic vent.
    view full answer...
  • Will 13,500 Btu Advent Air Rooftop RV Air Conditioner be Sufficient for 98 Square Foot Trailer
    For your travel trailer that is only 98 square feet, the Advent Air Rooftop RV Air Conditioner w/ Vent # ACM135CH that you referenced should have plenty of capacity with its 13,500 Btu per hour cooling capacity. Generally speaking this Btu per hour capacity is sufficient for a space that is up to around 550 square feet, so this should do a really nice job for your application. The air conditioner itself measures 24-7/8 inches long, 31-3/16 inches wide, and 12-13/16 inches tall. This...
    view full answer...
  • RV AC Unit Recommendation that Has Heat Pump
    The model you asked about has been discontinued and did not come with a heat pump assembly. I recommend the similar Advent Air # ACM135CH non-ducted system which does have a heat pump setup. It is a great system that will take the chill out of the air. If you have a larger trailer then the 15k unit # ACM150CH would be a better choice. If you already have an Advent Air AC unit then you can just add the heat pump. I recommend the Electric Heat Strip for Advent Air RV Air Conditioners...
    view full answer...
  • Advent Air Replacement Air Conditioner Installation
    If your replacement air conditioner installation followed the manufacturer's instructions there is not necessarily an issue with the unit being not quite dead-level. Keep in mind that trailers will vary in their stance - how level the overall trailer is when towed and when parked at a campsite. Was the actual mounting surface on the RV level? Are the fasteners possibly over-tightened on one side? If the unit functions properly, and without leaks, odd noises or other symptoms then...
    view full answer...
  • Can 2,200 Watt Honda Generator Power Avent AC # ACM135CH
    Yes, a Honda 2,200 generator will easily power the Advent Air RV Air Conditioner with Ceiling Vent and Start Capacitor part # ACM135CH. The Generac 3000i would work too. This AC unit draws 1,450 watts so either generator would power this unit with wattage to spare. Since this has a start capacitor you don't have to worry about a surge of wattage requirements on start up.
    view full answer...
  • AC Unit Recommendation for 2 Person Camper Trailer
    The Advent Air Command part # ACM135CH would work great on a smaller camper. It's smaller at 13,500 bTU instead of the higher 15k units. It's also set up for non-ducted applications like what your camper has as well so it would be a great option.
    view full answer...
  • Does Advent Air RV AC Unit fit Standard RV Vent Hole in Ceiling
    Yes the Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip # acm135ch that you referenced designed to fit the standard 14 inch by 14 inch roof vent hole on enclosed trailers and RVs. For more info on this check out the install video link I attached.
    view full answer...
  • Can Advent Air RV Air Conditioner Be Ran in Fan Mode Only
    The Advent Air RV Air Conditioner you referneced, part # ACM135CH can be ran in FAN mode only. You'd adjust the thermostat to the warmer settings then set the fan to the desired level. This will operate the fan without the A/C compressor. This is mentioned on page 12 of the owner's manual which I've linked for you to look over.
    view full answer...
  • Replacement Air Conditioner for a 2003 Mountain Aire 3781
    I am not sure the exact replacement that you are referring to but we have several options to replace the air conditioning unit in your 2003 Mountain Aire 3781. For this, the best option we have for a non-ducted unit is the Advent Air RV Air Conditioner with Ceiling Vent, Start Capacitor, and Heat Strip part # ACM135CH for 13,500 Btu's or part # ACM150CH for 15,000 Btu's. These systems both come with a rooftop unit, ceiling assembly, start capacitor, and heat strip. If you are replacing...
    view full answer...
  • How Does the Heat Strip Work On the Advent Air RV Air Conditioner Kit
    The Advent Air RV Air Conditioner Kit part # ACM135CH comes with a heat strip which is designed to take the chill off on cold mornings. The heat strip isn't thermostatically controlled, it will run while you have the control knob on the heat setting and it will stop when you have it switched off. The controls are on the bottom of the distribution box.
    view full answer...
  • Does Advent Air RV Air Conditioner # ACM135CH Have Exhaust Feature
    The Advent Air RV Air Conditioner # ACM135CH that you referenced features a fan that will constantly work to circulate air inside your RV but there isn't a dedicated exhaust function to help with pulling air out, especially while you're cooking. This is the case with any of our AC units. For the type of exhaust you're needing a dedicated system would need to be added such as the Ventline Range Hood # S0721-22BD-F-1.
    view full answer...
  • Can Rooftop RV Air Conditioner Cool Semi Truck Sleeping Quarters
    With its 360-cubic-feet-per-minute fan output and 13.5K-BTU cooling capacity the Advent Air Rooftop RV Air Conditioner # ACM135CH will have no trouble cooling your semi sleeping compartment or taking the chill out of the air on a cold morning. It should be able to effectively cool while still operating far below its maximum capacity.
    view full answer...
  • Can the Advent Air RV Air Conditioner Be Installed Using Wiring from a Ceiling Fan
    The Advent Air RV Air Conditioner part # ACM135CH is going to pull much more power than a ceiling fan would which means the circuit would most likely 1) not contain the correct gauge wire, 2) have the correct size circuit protection needed and 3) could be DC powered as opposed to the AC powered needed. Therefore, you'd need to run your own wires for the air conditioner unless you were replacing one that is already present.
    view full answer...
  • Availability of Advent 13,500 Btu Air Conditioner with Air Distribution Box # ACRG15
    There isn't a full Advent Air Kit available that includes the Air Distribution Box # ACRG15 in place of the standard model, however you could piece together your own kit using the individual components. To match the contents of the Advent Air RV Air Conditioner Kit # ACM135CH you were looking at (except for the Air Distribution Box) you would just need part # ACM135 for the 13,500 Btu AC itself, # ACMHD for the Heat Strip, # ACMSCKIT for the Start Capacitor, and # ACRG15 for the upgraded...
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  • What Type of Generator is Required to Powered AC Unit of Trailer
    The etrailer 2,000-Watt Portable Inverter Generator # 333-0001 could power a smaller 13.5 btu AC unit if it had a start capacitor like the Advent part # ACM135CH but most AC units require more watts than what this can put out upon start up. The start capacitor of this allows it to draw 1,450 watts on start up and when running whereas the Atwood # AT15025-21 draws 3,795 watts on startup and then 1,265 watts once running as it does not have a capacitor. So if you have an AC unit that...
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  • Recommended Air Conditioner for 26x7-1/2 Foot Enclosed Racing Trailer
    For your 26x7-1/2 inch enclosed trailer, based on your photo you will want two units. If you simply want to replace the unit, I recommend the Advent Air RV Air Conditioner w/ Ceiling Vent and Start Capacitor - White # ACM135C. This will give you the roof top unit, the vent assembly with built in thermostat, and a start capacitor to make sure you can start the unit even when the shore power is at an amperage that isn't strong enough for most systems to start. The capacitor helps with...
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  • Replacement Advent Air Conditioner for Ductless DuoTherm Air Conditioner
    I spoke with a representative of Advent, who told me the Air Distribution Box with Built-In Thermostat for Advent Air RV Air Conditioners # ACDB will only work with the Advent brand of air conditioners. So if your ductless DuoTherm distribution box is not working you can replace your entire unit with an Advent set up, which includes the distribution box and thermostat. You can choose based on the BTUs and color you want: - 13,500 Btu - White: Advent Air RV Air Conditioner with Air...
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  • Does Advent Air AC Unit ACM135CH Require Additional Relay
    You would not need to also purchase the relay part # PXXACRG12RB with the Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip # ACM135CH that you referenced. That relay is a replacement part for a different distribution box.
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  • Power Draw of 13,500 Btu Advent Air RV Air Conditioner
    The 13,500 Btu Advent Air RV Air Conditioner w/ Air Distribution Box, Start Capacitor, and Heat Strip # ACM135BCH (Black) and # ACM135CH (White) draws 1,450 watts so you will need a generator with that much capacity so keep the AC up and running. For that I recommend the 3,200-Watt Portable RV Inverter Generator - 2,900 Running Watts # 333-0003. I have added links to video reviews for you to check out as well.
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Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Video Edited:
Joshua S
Video Edited:
Jacob T
Video by:
Chris R
Updated by:
Mary E
Updated by:
Sarah W
Updated by:
Adam Y
Edited by:
Amanda M
Test Fit:
David F
Written by:
Halie H

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