If you're planning on making your home more energy efficient and comfortable, you may be able to get a bigger bang for your buck by air sealing your basement or making your HVAC system air tight.
Is your basement already finished?
If not, walk around and inspect the contractors work. Unfortunately, it's quite rare that they air seal the service penetrations (electrical, cable, gas and water lines) and rim joists or insulate the basement walls.
If you see fiberglass insulation jammed up in the rim joists areas...they are probably not air sealed properly. You could probably save more money air sealing the rim joists than adding R20 to your attic.
Free How To Insulation Videos @
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