A bit of background, I purchased my home 2 years ago, it was a foreclosed property. The furnace is about 20 years old. My contractor installed a brand new condenser unit outside. The furnace and ducts are in the attic on the third floor. Condenser is outside on ground level. The basic issue that has been present since I have owned the home is the air coming out of the ducts when the AC is on just isn't very cold. I measured around 68 degrees with an infrared thermometer. I had my contractor out here last summer trying to address the issue. They found some wiring issues that were causing the compressor not to run properly and pressure tested the coolant lines, recharged the system as at that point it had been sitting unused all winter and spring. It worked a bit better, I was getting around 65 degrees out of the vent. My contractor claimed that due to the long distance between the evaporator in the furnace and the condenser outside the system isn't going to cool as well as the system we have for the first floor rental unit, which works great. I'm very handy in the mechanical sense, I have done AC repairs on cars, aka evacuate system, vacuum test, and recharge. I have a set of gauges and vacuum pump. I would like to learn how to pressure test my condenser to see if this is indeed just due to the setup or if it's not working properly. When I measured the intake air at the filter I get about 76 degrees so to only get an 8 degree drop doesn't sound right to me. We have a window unit AC that we use to help cool the place down and that little unit blows 45 degrees out of the vents. Even a car AC system blows COLD air out. I would like to try to diagnose this myself if possible before so that if I do have to call a professional I don't get ripped off.
Here's the sticker on the back of the condenser.
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