A home energy audit is a way to benchmark how much energy your home currently uses and to determine what measures you can take to make your home more energy efficient. An audit will measure the efficiency of your home's heating and cooling systems and can also show you ways to conserve hot water and electricity.
You can perform a simple energy audit yourself or have a professional energy auditor carry out a more thorough audit.
Professional energy audits generally go into great detail. The energy auditor should do a room-by-room examination of the residence, as well as a thorough examination of past utility bills.
Many professional energy audits will include a blower door test. Most will also include a thermographic scan. There's also another type of test – the PFT air infiltration measurement technique – but it is rarely offered.