Hi all, so our dometic a/c (roof mounted) is now blowing warm air, or room temp air. Our ?service? guy said if we can put a ?port? on it, he charge it up with freon for us (yes, will get new service guy). Does that even make sense though? My next question is ...a few months ago I replaced the thermostat and I can?t help but think I screwed that up somehow. Upon installation I did test it, but it was cold out so maybe the fan air just felt like the a/c was working? This time, I had my husband go on the roof and listen, he could not hear the compressor run. If in fact it?s out of Freon, could that cause the compressor to just not turn on? What can I check on my DIY thermostat replacement? A lot of questions, thanks for any help.