My house has dual HVAC zones, and when the weather gets really hot (upper 90s with humidity), the unit in my attic struggles to cool the upper level. The inside temp starts to creep into the upper 70s, and the unit runs non-stop. I had 2 attic fans installed a few years ago, and that helped. I noticed that my attic is insulated to R30, and I am wondering if going to say R38-R40 would make a noticeable difference with my upper unit A/C. I guess at some point there are diminishing returns on insulation.
Would it be worth the cost to get a contractor to blow in more attic insulation? If so, what would be a reasonable cost per square foot to go from R30 to R40?
Would it be worth the cost to get a contractor to blow in more attic insulation? If so, what would be a reasonable cost per square foot to go from R30 to R40?