The more you insulate, the more your energy savings can add up.
Insulating attics, walls, ceilings, and crawl spaces can have a dramatic effect on your energy savings, and can create a more comfortable home year-round.
Insulating for Optimal Results:
The thermal envelope establishes a boundary. Heated and/or cooled areas are entirely enclosed by the envelope. Unconditioned spaces such as the attic, crawl spaces and the garage are outside the thermal envelope. You should insulate all exterior walls that separate conditioned spaces from unconditioned spaces. Insulating attics and basements close the thermal envelope from above and below making for an optimal comfort level inside with minimal leakage or infiltration.