Can I draftproof my home too much and make it too tight?

Reducing the air leakage in your home through draftproofing (air sealing) and other home energy improvements such as installing windows can increase your comfort and reduce your energy bills. However, when air sealing your home, it is very important to ensure that your home is still getting an adequate supply of fresh air. As part of your home energy improvement plan, ensure there will be sufficient mechanical ventilation to supply fresh air, and maintain good indoor air quality in your home. Many older homes are drafty and naturally ventilated through air leaks in your home; however natural ventilation may be allowing moisture to enter your building envelope or be pulling unwanted air from your attic into your living space.

To ensure your home has adequate ventilation, have an EnerGuide Home Evaluation performed on your home. If your home is too air tight, an energy advisor may recommend adding a balanced ventilation system, such as a heat recovery ventilator (HRV) to ensure adequate ventilation.

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