Get an Energy Audit
An energy audit entails a series of tests, including the blower door pressure test (shown), that tell you the efficiency of your heating and cooling system and the overall efficiency of your home. On the basis of the test results, the auditor will recommend low-cost improvements to save energy and larger upgrades that will pay you back within five to seven years. Audits take two to three hours and cost $250 to $400, but if you set one up through your utility company, you may be eligible for a rebate.
A basic part of an energy audit is the blower door test. The auditor closes all the doors and windows and then places a blower fan in a front or back door. This blower door test measures the 'tightness,' or air infiltration rate. The pressure and flow gauge shows the difference between the inside and the outside airflow so the auditor can calculate the air leakage rate.
Finding Air Leaks
Locating air leaks can be tricky. They're often so small as to be hardly noticeable. To find them, follow a trail of smoke.
Close all the windows in the house, turn off all the fans and exhaust fans, and shut off the furnace. Light some incense and walk slowly around the outer walls of the house. Anywhere you notice the smoke blowing away from something or being sucked toward something, there's probably an air leak. Now that you've found it, seal it! Here's how.