Infrared imaging is the process you are looking for and it is a specialzed event. You might have to call to a bigger city and start asking contractors if they offer that service.

Jim

Try contacting your local electric supplier. They should be able to refer you to someone who can perform this service for you. There is a definate advantage in that if your electric co. gives out referrals, you can be assured they are a reputable company.

Another great test is one involving a "blower door". This is a test where they come install a special temporary door and attach a huge blower to a duct in it, then they **** the air out of your house, or blow air in to create high negative, or positive pressure to test for air leaks around all areas of your house. Check out: http://www.epa.gov/hhiptool/
There is lots of great info on there about saving energy in your home. Some of these goverment agencies, and/or utility companies may even pay the cost of having such tests done in your home. See this page: http://www.epa.gov/hhiptool/envelope.html#insulation
Here if you scroll down you can see a tech doing a blower door test.

I've heard of universities doing free "appraisals" of the energy efficiency of a home. Might be worth checking in your area.