Replacement AC for Dometic 640315C751J0

Updated 08/03/2026 | Published 12/03/2024

Question:

Hi, I am looking to replace my dometic ac unit. We have a dometic model 640315C751J0. I understand it is a 13500 btu ac with heat with manual control non ducted and low profile in black. I would like to replace it with low profile black 15000 btu ac only and hoping not to have to change to roof cutout. What would you recommend and do I need to change the inside unit as well. Trying to be as economical as possible and keeping it simple so I can do it myself. Many thanks

asked by: Rod H

Expert Reply:

Hi Rod; for a simple plug and play low profile replacement for your Dometic setup you can use the Dometic Penguin II High Capacity RV Air Conditioner w/ Heat Pump # DMC33ZR. This is designed to replace units with the manual air distribution box like yours and will not require replacing the inside unit.

expert reply by: Robin H

Robin H.

11/17/2025

Hey Rod, how did the swap to the Dometic Penguin II work out for your setup? It sounds like it should have been a straightforward fit with your existing inside unit. Sharing how it went could help others planning a similar upgrade.

Rick P.

8/2/2026

Robin if I wanted to replace my 640315.751JO-M what unit would you recommend if I didn’t want to upgrade but replace only?

Robin H.

8/3/2026

@RickP the only thing we have left that would work is the Furrion Chill HE # FR86PR (if you have a 6-pin connector) or # FR32PV (9-pin connector). These are our remaining R410A units. Anything that is the newer R32 will require a full system replacement.