Replacement Options for Older Atwood Carrier AC Unit In 2005 Keystone Outback 28fls Ducted

Updated 10/27/2025 | Published 10/22/2025

Question:

Want to know if this unit is compatible with carrier ac unit 2005 keystone outback 28fls ducted with remote controlling furnace and ac

asked by: Kevin B

Expert Reply:

So we actually do not carry Atwood anymore, and even if we did, there was a big update to the refrigerant types, making older systems no longer compatible with newer replacement parts (aside from some old stock that you may be able to find elsewhere or on a resale site).

That being said, your best bet is to update the entire system with something like Advent Air RV Air Conditioner System - Single Zone - 15,000 Btu - White - R32 # ADV92SR. This is basically the same ac unit you were looking at, but it includes everything you'll need, such as the thermostat, air distribution box that goes inside the ceiling, and even a start capacitor (soft start) which allows less amperage draw on startup.

Since your 2005 Keystone’s Carrier system used a remote-controlled wall setup that also ran the furnace, the key thing to know is that the new Advent system will replace both your AC control and its thermostat functions. The furnace can still be controlled through the new wall thermostat that comes with this kit, so you’ll be able to operate both the AC and heat from one unit again once everything’s wired in. Your installer will just need to connect the furnace’s low-voltage control wire to the new thermostat - pretty standard for a full system upgrade.

Let me know what you think! This should be a good setup to get your AC system updated.

expert reply by: Andrew N