Make a list of any existing problems, such as condensation and uncomfortable or drafty rooms.

Next, look for air leaks. They are common around electrical outlets, switch plates, window frames, baseboards, weather-stripping, fireplace dampers, attic hatches, and wall or window-mounted air conditioners. When inspecting windows and doors for air leaks, if you can see daylight around the door or window frame, that is where the leak exists.

When looking at the outside of your home, examine areas where two different building materials meet. This includes exterior corners, areas where siding and chimneys meet, and places where the foundation and the bottom of the exterior brick or siding meet. Make sure to plug and caulk holes or penetrations for faucets, pipes, electric outlets, and wiring. Also, look for cracks and holes in the mortar, foundation and siding of your home and seal them with the appropriate material. Finally, check the exterior caulking around doors and windows to see if they are sealed tightly.

When performing your own home audit, make sure to examine the ceilings and walls. If these two areas are not properly insulated, you risk heat loss in the winter and cool air loss in the summer. Check to see the attic hatch is as heavily insulated, as well as weather-stripped and closed tightly. In the attic, determine if openings for items such as pipes, ductwork and chimneys are sealed. If you see any gaps, seal them with expanding foam caulk or another permanent sealant.