It’s an audit by a qualified company to determine the efficiency of your heating, insulation, doors, windows, etc.
The audit considers a home a “system” where the components work together to determine where you might improve and save money on energy costs.
The contractor provides a series of tests.
A blower door test and a duct blaster test are done. This determines if there are potential “leaks” that can be plugged around windows, doors and furnace area.
They also should check for air-flow pressure, energy efficiency, moisture and air-quality issues.
Here’s the thing.
Many of the recommendation are inexpensive fixes. You normally don’t have to replace windows or doors—just provide additional insulation.
Good air flow may be a matter of cleaning your furnace or servicing your air conditioning unit.
Most of all, you may save a ton of money in energy costs.