Carrier A/C Model 38CKC030-340 repair question
My a/c doesn't seem to be working properly again. I have a long history of problems with this unit and I am hoping someone will have some good advice for me. I live in Michigan. My house is 3500 sf plus a finished basement. House has two compressors and it is my upstairs unit that gives us the problems. I don't think I have ever been able to get the upstairs cooled below 70 even on a mild summer day. Here is some background info:
New construction with new unit (Carrier Model 38CKC030-340)
A/C not working well. Repairman says "too much freon" and "puts correct amount".
Not working again. Repairman says "compressor valves are bad." He installs new compressor, liquid dryer and suction dryer.
Not working again. Repairman adds 2 lb R22 freon.
Working ok. Repairman out for another reason. Checks this unit and adds 1 lb R22 freon.
Not working again. Repairman says "Plugged outdoor coil". Replaces compressor, capacitor, and filter dryer.
Not working "well." Repairman adds "small amount" of freon.
So I am about to call the cooling company back now because although it is only 78 degrees out, I can't cool my upstairs below 72. I think I should be able to get my upstairs COLD in these conditions. Am I wrong? Also, three compressors in seven years???
Thanks for any input.