Cheap and Easy Heatloss Detection?
Monty asks: "I'd like to measure heat loss to find out where to insulate and then find out if that is working. What can be done cheaply? Can I use my Sony's Nightvision and just cover up the IR emitter? Are there cheap but useful infrared cameras? What about plain infrared film? Or how about temperature data loggers? Where's a good place to ask these questions?"
An easy way is to look at your roof after a frost (or light snow) -- see how it melts compared to your neighbors, and see if there are any hot spots.
You could check out the Habitat for Humanity - Infrared Insulation Test. It seems they got a special camera from the DOE. I remember a few years back my utility company had a camera that they would use to check out your house if you gave them a call. You can also get IR film for 35mm cameras, but not sure it would do a very good job.
And to save you some googling, here are a few links
Photo know-how : Infrared 101
Infrared photography
A comparison of infrared films
Infrared photography