Three essential elements of an energy-efficient home are airtightness (achieved through draftproofing), insulation (ample amounts) and sufficient ventilation. Combine all three, you get a comfortable, low-energy, lower carbon home with excellent indoor air quality year-round and lower heating and cooling bills. Additional benefits include reduced drafts, noise, and moisture problems.

Reducing air leakage through draftproofing (also known as air sealing) is a cost-effective, energy-saving measure that you can undertake without hiring a contractor. The leakier the home, the greater the opportunity for improvement and energy savings. In addition to reducing heat loss and energy bills in the winter, draftproofing keeps your home cooler in the summer, and improves the comfort and health of your home.

Did you see a building science or energy efficiency term you did not understand? Check out our glossary.