I have an AC that works great when it's under 94 outside, but anything above and the temp slowly rises in the house, then takes a long time to get out, usually until 11pm at night, sometimes all the way until 3 in the morning. I plan on adding some insulation to the house, as I just had the coils cleaned and I would like to hopefully not have to buy a new AC unit. Where I live in Texas we have been experiencing pretty hot weather, 100-105 for most days the past month and half-ish. When I go into the attic and touch the main ductboard trunk line, I feel that it's pretty cool to the touch and can tell that AC is in it. Can/Should I use any of the duct insulation @ home depot/lowes? From what I've read online it says that ductboard doesn't need insulation, as it's inside of it. This weekend we plan on adding 6 more inches of cellulose blown insulation to bring it up to 12", installing solar window screens on the W/SW side of the house, and probably adding an attic fan. Should I worry about further insulating the ductboard? Does anyone think this will be enough? Any alternative suggestions?
