| Looks like your A/C unit is OK. Now your fan, is it a new fan ? or 21 year old fan. Needs to check to see if the fan needs to be replaced. Don't put a larger one unless you know the size limit of your A/C and Furnace. They all have to match. Now your upstair rooms above the garage. Since the garage is not cooled, so it is very hard to keep the rooms above garage cool, most people have this problem unless when you built the house, you put extra extra extra thick insulation under those rooms. Since the house was built in the 60s, I really doubt you have good insulation in there. So, I believe your main problem is not enough air go to upstair, may be the duct is too small, or may be too many turns which weaken the air pressure. not only you need good air flow to upstair, you need a very strong one because of the garage issue. I had a house with a above garage apartment, I had the same issue even my air flow was Ok. I ended up bought a large window unit to compensate the situation. You see you can not tear up everything to redo the air duct and the in-wall insulation. So window A/C was my way (not a perfact way) to deal with this
prblem.  |