Here is the history:
First season the system was installed, it started blowing warm air. Installer came & told us "central a/c can freeze up sometimes so next time turn it off for 1/2 hour then turn it back on". We didn't know any better, did what he suggested and it always came back on. This has been going on for years. Some seasons it worked with no problem. Other seasons it may have turned off once. Last year worked all season. This summer was as follows: June - suddenly was blowing warm air. We turned it off for two hours then it came back on. Service tech came out & could not find a problem but put in a new capacitor anyway. We had a heat wave for two weeks 99 -105 - system never turned off but the inside temperature on my first floor would not go below 73 and the upstairs would not get cooler than 76 until the evenings when it was about 80 outside. After heat wave, it worked well then last weekend; outside temp was 85 with low humidity. Started blowing warm air. Turned it off for an hour and it went back on and has worked perfectly since. I have had a service contract with the same company for 8 years now. Two years ago during annual check-up needed to add 1/2lb freon, last year none was required but beginning of this season put in 1 lb. Had a new Service company come to look at it today. Said no freon needed, compressor working and checked out. I don't know what he checked outside but told me to set thermostat low so compressor stayed on. Never looked at unit "inside" the house just outside but used a device to check temperature of air coming from my vents indoors. Following is his diagnosis today: right now a/c working like a charm, no fluid needed, but amp (think that is the word used) was twice what it should be indicating that the compressor struggling to keep up. Said it was never freezing up (as I was told by original installer) instead it was overheating and by turning it off for 1/2 - 1 hour cooled off the compressor and got the system going again. Said this usually occurs when compressor is getting old. (my home is 10 years old). I asked, then way has it been doing this on and off since house was built? His reply was that compressor was defective. Does any of this make sense? Something doesn't sound right to us but we are not the experts. Is there something I should say to them or ask if they checked? Please help!!!! He was at my home for 20 minutes and never checked the inside unit. He told me we may want to think about getting a new compressor R22 (which he said there are none around) or put in an brand new everything!!! I need your opinions please. Oh, and I think these guys talk to the service company I have been using for the past 8 years.