After looking here A/C not keeping up and also here Air Conditioner Can't Keep up .
I have decided to ask a question that perhaps someone can provide me with more insight.
My AC unit was doing just fine keeping up, until one after noon I had turned the unit to off unintentionally and then back on (kind of quickly - because as I said it was unintentional that I turned it off). Since that time the unit has had a hard time keeping up. I mean I noticed it from the time I turned the thing back on it did not shut off but kept running and the temp in the house was not dropping.
I have a 3 ton R-22 unit (36,000 BTU), the normal pressure readings on the nameplate are 74 for the low side and 244 for the high side. The house is 1300 SQ FT with normal 8' ceilings.
The reading on the low side was 74 PSI and the reading on the high side was 205 at an ambient temperate of about 90 degrees. I am not sure what this is telling me - my indoor temp was at 75 degrees - I have not taken a thermometer to the duct work above the evaporator coil or the vents. Coils are not perfectly clean as in like-new; but they are clean (and I would not suspect everything fine and then because I switched off and then on - suddenly they are an issue.) My filter is clean, I changed the old one out at the time this started because I had new ones and said what the heck it will not hurt it.
Both the evaporator and the condenser fans are running fine.
So, I am wondering "what has changed to cause this issue?"