Dometic roof top ac

atsrmf wrote:
This new Coleman A/C would cool my RV to 30 degrees below ambient in a short time. The old one (R-22) struggled to make 20 degrees. It went out in the trash. It was 31 years old and used R-22.

https://photos.app.goo.gl/g5jRBkgo3Liquygi9

Freon 22 versus 410. There is NO difference in cooling capacity. The only difference is, the 410 requires HIGHER pressures to do the same job as Freon 22. 13.5 BTU is 13.5 BTU. HOW you get there is no concern. As long as it does what the BTU states. Your other statement is nonsense also. There is no standard or correlation between OUTSIDE(ambient) and what the inside temp will be. ALL the RV AC does is take the INSIDE hot air and cycle it and output COLD air. Has nothing to do with Ambient temp. Ambient temp will affect how cold the INSIDE will get, but you cannot expect the temp difference measurement to be a test of how well the AC cools. Also, since I have been in the business 45 years and still am. 31 year old Freon 22. Well that means it was NOT ducted. Ducted systems (starting in the early 90's, really made RV AC systems better at cooling and yes, those were Freon 22 systems. Back in 2001, I took a customers DSDP with 2- 15k HP's(Freon 22) and at 103 ambient at 5 PM. it was 68 degrees in the Living room and bedroom. Doug