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  1. RV Air Conditioners
  2. Advent Air
  3. Complete AC System
  4. 13500 Btu
  5. Ductless
  6. Cool Only
Advent Air RV Air Conditioner System - Manual - 13,500 Btu - White

Advent Air RV Air Conditioner System - Manual - 13,500 Btu - White

Item # ACM135C
Our Price: $706.97
RV Air Conditioners
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Ductless AC unit lets you replace an existing AC or add a new AC to your RV. Air distribution box has a built-in thermostat to control the fan and temperature. Start capacitor jumpstarts the AC when camp power or generator power isn't enough. Great Prices for the best rv air conditioners from Advent Air. Advent Air RV Air Conditioner System - Manual - 13,500 Btu - White part number ACM135C can be ordered online at or call 1-800-940-8924 for expert service.
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Advent Air RV Air Conditioners - ACM135C

  • Complete AC System
  • 13500 Btu
  • Ductless
  • Cool Only
  • Advent Air
  • With Start Capacitor

Ductless AC unit lets you replace an existing AC or add a new AC to your RV. Air distribution box has a built-in thermostat to control the fan and temperature. Start capacitor jumpstarts the AC when camp power or generator power isn't enough.


  • 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
  • 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
  • Electric heat strip (ACMHD - sold separately) can be added to remove the chill on cold or frosty mornings
  • UL and cUL certified


  • Application: Motor homes, travel trailers, and fifth wheels
    • Not approved for school buses, food trucks, enclosed/utility trailers, or off-roading vehicles
  • Fits: roofs 2-1/2" to 5" thick
    • Opening size: 14-1/4" long x 14-1/4" wide
  • Air conditioner power draw (while starting and running): 12.6 amps
  • Compressor power draw (while running): 9.9 amps
  • Fan motor power draw (while running): 2.6 amps
  • Capacity: 13,500 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
  • Refrigerant: R410a, 16.9 oz
  • Wire gauge: 12 AWG
  • Air conditioner weight: 68 lbs
  • 2-Year limited 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. 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 cool settings and the 3 fan speed settings, which let you increase or decrease the airflow. If you add an electric heat strip (sold separately) to remove the chill on cold mornings, then the dial also controls 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.

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.

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

Advent Air Warranty Coverage

2-Year limited warranty covers defective units when installed correctly on approved applications. The warranty does not cover units installed incorrectly. To ensure air conditioner is installed correctly, please see the questionnaire pdf below. A filled-out questionnaire is required for warranty coverage.

If you are not comfortable using a voltmeter (or removing the charge from the start capacitor), youll want to make a service appointment with your local RV dealer to verify the installation. Print the pdfs below (warranty- questionnaire, warranty dealer information) and take them along with the RV to your local dealer. ASA does compensate dealers for warranty work as outlined in the dealer information pdf. You may be charged by the dealer for time spent investigating the installation.

Warranty - Questionnaire  AA Questionnaire

Warranty - 2-Year Card  AA 2-Year Card

Warranty - Dealer Information  AA dealer info

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

Installation Details ACM135C Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Advent Air RV Air Conditioner System - Manual - 13,500 Btu - White - ACM135C

Average Customer Rating:  4.5 out of 5 stars   (392 Customer Reviews)

Ductless AC unit lets you replace an existing AC or add a new AC to your RV. Air distribution box has a built-in thermostat to control the fan and temperature. Start capacitor jumpstarts the AC when camp power or generator power isn't enough.


Overall I'm happy with the unit. Installation was pretty straight forward double checking our progress along the way. Upon connection to power the GFCI tripped, this resulted into triage finding one wire penetrated by a screw from the junction cover. Start to finish with removal of the old roof vent and quite a bit of conversation was six hours.

One small discrepancy which was welcomed is the directions for the rooftop unit specify a 2.5" - 5" roof but further provide ducting instructions for 1"-2" roofs. I had purchased plywood anticipating the need for a spacer but happily skipped it.

Originally shipped unit was damaged in transit and etrailer made that whole exchange quick and easy, I was actually quite impressed.


Great a/c unit. Happy with the price. Installed myself - super simple/really quick. The “easy start” capacitor option is a “must have”. Very low current drain at start-up compared to the old one that I removed. Cools fast. My entire motor home (36 ft) was quite comfy in about 15 minutes. It could be a little quieter but the tv volume has been up to the challenge so far.



All of my comments stand. I am, however, a little disappointed by the amount of condensation drip through the control unit. I have to put a pan on the floor to prevent a puddle from forming. Be especially watchful if you have carpet underneath. Also, when you install it for diy-ers attach a drain tube to the main unit or there will water down the side of your rvmy.

Etrailer Expert

Mike L.


@Michael Thanks for that advice...


Shipped in no issues. Went to install and found the smaller square cut for airflow was off by almost an inch which also pushed the tab for the mounting bolt out, causing everything else to be unaligned. Had to cut and fill in to fit everything correctly.


etrailer customer service again never fails I received my shipment yesterday and one of the boxes was open and one part was missing I took a picture of it called customer service sent it to him and within 24 hours the replacement has been sent. There was no question about the claim or need to file it with UPS. I've had several different transactions with etrailer their website is great easy to use and if I have any questions, I can get quick answers from a real person and the customer service has always been great tracking etcetera highly recommend etrailer.


Easy install. However the capacitor had to be replaced after a couple months. The capacitor came quickly and easily installed. Nice unit and works great. I have it installed in our Florida home which is a single wide 8x35 with a lanai.


E trailer made things pretty easy. I needed a new AC unit for vending trailer use. The old model was discontinued, but a replacement was offered, and purchased. Fairly simple installation, and reasonably priced. Their team had knowledge of the product, and I was pleased with the purchase. Works fine so far.


Easy to install works great I got the heat option that comes in handy to knock the chill off in cooler weather looks like the original unit very happy with product!


Cranks cold air! Cools my sprinter in minutes. Easy to install a wire up. Cheap!


We bought this to replace our Dometic in our Jayco 145RB. The installation was easy and straightforward. The toughest part was getting it on the roof. Sliding it up a ladder on the side of the trailer worked very well, but it is heavy. It takes a bit longer to cool the trailer down than the Dometic (I'm guessing that's because the Dometic has 4 vents and this one has only 2). If you have any mechanical skills at all, you should have no problem with this install. I would suggest watching the video posted on etrailer regardless of your experience. Their tip to turn the AC to Medium cool after the tailer is cooled down is a good one, even in 90+ degree heat. I will purchase from etrailer again. They ROCK!


Easy Installation. Excellent cold air. Perfect fit. Fast delivery. Intelligent customer service care


E trailer is a great place to do business with. I have bought 3 of there air conditioners from them and no problems at all


Missing parts
No number to call to locate
missing parts

Etrailer Expert

Brooke M.


I will make sure our customer service team reaches out to you about this. Thanks for letting us know!


Over the years I've bough two Advent A/C units from Both units are doing great. I have encouraged others to consider Advent Air when they are looking for a replacement.



These units are still working great. Advent makes a good product.


This is a nice unit. Very easy to install and cools nicely. My only complaint is that it is a little loud. This like it overall.


Easy to install. Perfect for our little camper


AC may be OK but e trailer is not.


This is the 2nd one I have purchased for a vintage camper. Great product @ a great price!

Charles J.


After 1 year, the Advent AC continues to perform as new. Very happy with both that I have ordered and installed.


This company went above and beyond in customer service. My a/c was in schedule from the moment it was ordered. Everything that was advertised about this unit was correct. Easy install under 2hrs plus runs off of my 2000w Honda generator. I will definitely be using them again for all of my trailer needs


Terrible unit, if I could give a zero rating I would. I had it installed in the Bunk room of my travel trailer. The air blows up at the ceiling. I have to run 2 fans in the room to keep it circulating.


I just received this material today and have not opened yet .I will not be installing until weather warms in late winter. What I have seen so far products look of high quality and your service has been outstanding . I have told friends about your website easy to get around in and helpful staff. Keep up the good work. Look forward to my next purchase , Thanks again, Mike W


Installation was simple and unit has preformed perfectly and we have had our rv in several states. Highly recommend.


Glad it arrived quickly! I especially liked the detailed installation video on the site, it helped a lot.


This Company has been very helpful for us.When you call them they are very polite and the freight was extremely fast on a AC unit that we purchased.Would highly recommend.


Super fast delivery, happy with product!


Easy to install, I'm very happy with the unit. Toughest part is getting it up on the camper roof. Two people are needed because the unit is too bulky handle alone.

Show More Reviews

See what our Experts say about this Advent Air RV Air Conditioners

  • Air Conditioner Recommendation For 24 Foot x 8 Foot Enclosed Trailer
    For a 24' x 8' enclosed trailer, you're looking at about 200 square feet, and for that size, I recommend a 13,500 Btu air conditioner, which will more than suffice for that space. I also highly recommend a start capacitor to go with the AC in order to ensure your unit always has enough power to start up whenever you need. With that in mind, there are two really good options for you, both from Advent. One has a thermostat and controls directly on the air distribution box, and the other...
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  • Does Advent Air Rooftop RV Air Conditioner Remove Humidity
    When an air conditioner is running properly it does remove humidity. So the Advent Air Rooftop RV Air Conditioner # ACM135C would remove humidity. There is a drain system in this kit as well.
    view full answer...
  • Can Shorter Screws be Used For Advent AC ACM135C if Roof is Not 2-1/2 Inches Thick
    You shouldn't just use shorter screws if your roof is not 2-1/2 inches thick when installing the Advent Air RV Air Conditioner w/ Air Distribution Box and Start Capacitor - 13,500 Btu # ACM135C. The issue isn't just the hardware, it's the fit of the entire unit, including the distribution box, as well as ensuring the overall strength of where the unit attaches to the roof. If yours isn't 2-1/2 inches thick you'll need to build up the base with supports. I have added a link below to a...
    view full answer...
  • Adding Second Air Conditioner to Thor Chateau 31W
    You'd have a hard time getting a non-ducted roof opening to tie into your current ducting so since that's what your application is you'd want to go with a non-ducted setup. For that the Advent Air part # ACM135C would work great. It comes with a non-ducted vent assembly and a start capacitor to make power consumption a little easier.
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  • AC Replacement Recommendations for 15k Ducted BTU Opening and 13.5k Non-Ducted
    There isn't a way to install a ducted AC unit in a non-ducted ceiling hole unfortunately. You'll have to go with two new units like the Atwood Air Command # AT15028-22 for the ducted application you want a 15k btu setup for and then for the non ducted roof opening you'd want the part # ACM135C which is designed for 13.5k btu.
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  • AC Unit Recommendation for 28 Foot Enclosed Trailer
    Based on the square footage of your trailer and the hot climate you'd easily get by with a 13,500 btu unit like the Advent Air # ACM135C. The units blow much colder air, plus this kit comes with the ceiling unit so that you can control it since your trailer wouldn't have ceiling ducts.
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  • Replacement Shroud for the Advent Air Conditioner part # ACM135C
    You are looking for either the Replacement Cover for Advent Air RV Air Conditioners - White part # PXXMCOVER or black part # PXXMCOVERB. These measure 30-5/8" long x 25-3/4" wide x 10-1/2" tall.
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  • Does Advent Air Rooftop RV Air Conditioner Need a Mounting Bracket
    The Advent Air Rooftop RV Air Conditioner # ACM135C does not require a mounting bracket to install, just a 14-1/4" x 14-1/4" opening and a framed with 3/4" lumber, as you can see by the accompanying cut out I added from the linked installation instructions.
    view full answer...
    Image 1 for
  • Install, Sound Level, and Reliability of Advent Air AC Unit and etrailer Generators
    You would need to open the hole up in your trailer roof a bit to at least 14 inch by 14 inch to install the Advent Air RV unit part # ACM135C that you are wanting. This was designed to be hardwired an not plugged into an AC outlet like you have which is a bummer since that would be really convenient. We do have install instructions for this that are linked and are currently working. If you still have issues though let me know and I can see if I can get them cleared up for you. Your outlet...
    view full answer...
  • Does Advent Air RV AC Unit for Coleman Setups Come with Ceiling Control Panel
    The Advent Air Replacement RV Air Conditioner for Coleman Setup # ACCOL135 that you referenced was designed to attach to a Coleman ceiling control panel which is why it does not come with one. For a similar setup that does come with a ceiling panel you'd want the part # ACM135C instead.
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  • What is Amperage Draw of Advent Air RV AC unit part # ACM135C
    The Advent Air RV AC unit part # ACM135C draws a max of 15 amps when in full use, the compressor when running draws 9.9 amps and if the fan motor was just running would draw 2.6 amps. The decibel rating is 76.
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  • Recommended RV Air Conditioner For A 2008 Rockwood 282XRT Popup Camper
    Out of the RV air conditioners we carry the Advent Air units have the smallest roof thickness requirement at 2-1/2" - 5" thick. In the attached installation video you can see how David increased the thickness of the roof to be able to install a new unit. If you want to completely replace your system (rooftop unit & air distribution box) then I recommend the Advent Air RV Air Conditioner w/ Air Distribution Box and Start Capacitor - 13,500 Btu # ACM135C. If you want to replace just the...
    view full answer...
  • 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...
    view full answer...
    Image 1 for
  • Is Sealant Required to Install the Advent Air Rooftop RV Air Conditioner
    No, it is not necessary to use sealant when installing the Advent Air Rooftop RV Air Conditioner # ACM135C on your trailer. This unit is designed so that is not necessary because it has a thick gasket that prevents water from leaking in. I have added a link to the written install instructions of this AC unit for you to take a look at.
    view full answer...
  • AC Unit Recommendation for Enclosed Cargo Trailer that is Insulated
    The Advent Air Rooftop RV Air Conditioner # ACM135 that you referenced would work great for your application but since you'll also need the ceiling vent and thermostat your best option is the # ACM135C which is a kit that includes that as well. This will give you great cooling for the smaller room and since you've done a great job insulating the room it will stay cool longer and easier. I am sure some people have successfully ran a generator while travelling but we do not recommend it....
    view full answer...
  • Generator Recommendation for Advent Air RV Air Conditioner w Start Capacitor # ACM135C
    The Advent Air RV Air Conditioner w/ Ceiling Vent and Start Capacitor # ACM135C draws 1,450 watts for running and starting. Since it comes with a start capacitor there isn't a higher starting watts requirement as the capacitor takes care of that surge. So you'd need a generator with at least a 1,450 watt power rating. I'd recommend the etrailer 3,200-Watt Portable Inverter Generator # 289-SUA2000i as it easily covers your wattage requirements, is very quiet, is fuel efficient, and provides...
    view full answer...
  • What is the Correct Size AC Unit for a 30 Foot Long Trailer
    The correct size air conditioner for your trailer is going to depend of several factors such as square footage, ambient temperature, number of rooms, etc. However, I can say that a 30' long enclosed trailer would be best suited with two 13,500 btu units. For this, I recommend the Advent Air Rooftop RV Air Conditioner part # ACM135C which is for non-ducted trailers that I assume is what you have. If you want the heat pump then use # ACM135CH instead. The air conditioner can cool up to...
    view full answer...
  • Economically Priced AC Unit Recommendation for Trailer Not Ducted for AC
    Since the trailer does not have ducts built into it for AC venting you'll want a non-ducted AC unit like the # ACM135C which would work well. This is our best priced kit that comes with everything needed to install.
    view full answer...
  • Solar Panel Kit Ability to Run Air Conditioner 24/7
    The Go Power Solar All-Electric Kit will not be enough to power the air conditioner unit 24/7. The Advent Air RV Air Conditioner w/ Ceiling Vent and Start Capacitor - White # ACM135C will have a running wattage of 1,450 so the power draw is substantial and when using the Go Power Pure Sine Wave Inverter - 1500 Watt - 12V # 34279950 you will have the power to run it, but the battery bank will deplete as the solar cannot create enough charge to recharge the batteries when the AC is running....
    view full answer...
  • Does Advent Air Rooftop RV Air Conditioner Come with Gasket
    Yes, the Advent Air Rooftop RV Air Conditioner # ACM135C that you referenced does come with a gasket. I attached a picture of the gasket for you to check out as well.
    view full answer...
    Image 1 for
  • Quiet RV Air Conditioner Recommendation for Non-Ducted Application
    Advent AC units are considered by most RVers to be the most quiet and the most efficient so that would be the brand I would recommend. Since you have a non-ducted roof setup currently the best option is the Advent Air part # ACM135C. This is also 13,500 btu like you said you need as well.
    view full answer...
  • How Does The 13,500 BTU Advent Air Conditioner Compare To A Coleman Unit
    Advent Air Conditioners in my opinion are very comparable to the Coleman brand and hold up very well. I recommend the Advent Air RV Air Conditioner w/ Air Distribution Box and Start Capacitor Item # ACM135C for your 2003 Jayco. It is a complete AC unit with start capacitor and ceiling assembly. The start capacitor acts as a jump starter and is designed to store energy so your ac unit starts up and gets cold much faster while using less start up power. If you are looking for a complete unit...
    view full answer...
  • Adding Second AC to 2019 CrossRoads Zinger Travel Trailer
    If I were adding a second AC unit to a travel trailer, such as the 2019 CrossRoads Zinger Travel Trailer, I would select a unit that has a start capacitor installed and comes with an air distribution containing the controls such as the Advent Air RV Air Conditioner w/ Air Distribution Box and Start Capacitor, # ACM135C. The included air distribution box has a built-in thermostat that lets you set the fan speed and temperature. The included start capacitor will help jumpstart the AC. This...
    view full answer...
  • Recommended Way To Power Air Conditioner Unit In RV
    I do have an option for you but it is not possible to power an air conditioning unit off of a solar panel with a trailer set up because you would need an extremely large solar panel to put out enough power. For example the Advent Air RV Air Conditioner w/ Ceiling Vent and Start Capacitor - White # ACM135C has a running wattage of 1,450 so the power draw is too great for a solar setup. The best way to power an air conditioner is with a generator. I recommend to use the 4,500-Watt...
    view full answer...

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Updated by:
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