Home energy audits:

photo: US department of energy

1) Locate air leakage in and out of your home's structural envelope: Windows - Doors - Light Fixtures - Electrical Outlets - Wall Plates - Closets - Baseboards - Attic Hatches - Wall or Window Mounted Air conditioners

2) Inspect and/or test heating & cooling system ductwork for level of efficiency.

3) Evaluate attic insulation levels and ventilation performance.

4) Inspect wind turbines and air vents.