I'll try and give as much info as possible, whether needed or not. 1250 sq
ft, brick ranch, 1956 construction, original windows. Insulation - so/so.
Cleveland, OH area - we'll see a few mid-90s days a year.
Had a Amana SV 80 furnace 70,000 BTU (maybe 75,000, whatever amana makes in
that "size") put in in October. Worked great through the winter, though I
wish it was quieter. We decided to have the installer wait and replace
outdoor AC unit in spring. Indoor coil was a 2.5/3 Ton unit, he says he
installed the 3 Ton valve in it. His plan was to have a 3 ton indoor setup
paired to a 2.5 ton outdoor unit.
I just had the AC compressor put in this week. It's not cooling all that
great. He said a 2.5 Ton was plenty big. I warned him that this house got
hot easily (black roof) and that the previous AC had to literally run all
day long on hot days just to keep the temp even. On hot days with the old
unit, whatever temperature I turned the AC on at, was the temp it was able
to simply "hold steady" during the day, only starting to drop after the sun
The other day I turn on the new AC. Outdoor 85F. Indoor starts at 84F and
hits 80.5F in 2 hours. Humidity drops 6% during this time, from 36% to 30%.
So it's better than the old system but this still seems weak to me. I'm no
expert but I would have thought more than 3.5 degrees in 2 hours. I
measured the air coming from a medium-length duct run as 63 F.
I noticed he did NOT add any refrigerant to system. I realize it's
pre-charged from factory but the manual says it's charged for up to 15' of
pipe if I'm reading correctly. I have about 30' to the indoor coil.
Also, how do I set the blower speed of the SV 80 furnace during cooling? I
found the diagram that shows which color wire to use for lo/med lo/med
high/high during heat operation, but it just says "check installation
instructions for setting blower for cooling operation". I didn't find the
info in the installation instruction booklet. Isn't there a separate speed
setting during cooling? I'm thinking going up one speed may help me out.
What should I do first? He did measure the pressure of charge at install.
If it was near the min of the range and he added some would that help me
noticeably? Can I bump up the blower speed? (I know the air won't dry as
much, but I don't like very dry air, messes up my sinuses.) Should I bite
the bullet and request he get rid of the 2.5 ton outdoor unit and put in a 3