Americans spend large chunks of their money on heating and cooling. A house that is properly and sufficiently insulated:

  1. Is more energy-efficient, and therefore, saves the homeowner money.
  2. Does not need extra effort and expense to keep it comfortable – insulation is permanent and usually does not require maintenance.
  3. Is more comfortable. Floors are warmer, and temperatures are more uniform throughout the house. Thermal insulation of buildings is merely one means of achieving indoor comfort and energy-efficiency. Weatherization and thermal mass are others.
  4. Absorbs outside noise and is quieter.
  5. Two indications that a house is poorly insulated and poorly ventilated:
  6. Dew and frost forms on cold surfaces in the attic, such as on the underside of the roof sheathing, during the winter.
  7. The attic is oppressively, almost unbearably hot in the summer.
  8. The phrase “thermal envelope” refers to the conditioned or living space in a house. Normally, people treat the attic and basement as unconditioned space, but you can make either the basement, or the attic, or both, part of the conditioned space, if you choose.