Another cheap alternative, *IF* you have a 35mm film camera (not
digital) is to buy some infrared film and take pictures. Have to wait
until they're back from developing, but not too bad. Google '35mm
infrared film'.
....
Hey, that is a market niche for somebody to exploit- have some company
that makes store-brand disposables do a production run of ones loaded
with IR film, package them with instructions and a prepaid processing
envelope, and sell them in the insulation and weatherstripping aisles at
the big-box stores. (If anybody out there makes a go of that, I want a
cut of the profits...)

I can see it now- thousands of DIYs out there at midnight in winter
coats, taking pictures of there houses, while the neighbors call in
prowler reports... :^/

Afraid it ain't that simple. "Infrared" sensitive film
is NOT picking up the "heat" (term used a bit loosely)
emissions/reflections that you're looking for.

These products record the "near infra-red" part
of the spectrum. To get the termperature numbers,
you'd have to get to "far infra-red".

"Near infra-red" is the part of the spectrum that's
just beyond the regular "red" in the rainbow.

You might have heard the screams about five years
ago when Sony's camcorders, when in "nightshot"
mode, could "see through clothing". THe reality
is that the sensors could pck up "near infra-red".

Many materials that look "black" are really very, very,
dark red - letting a teensy bit of visible red
through (so small it looks blackish) but a modest
amount of near infra-red. So these cameras could
kind of, in some instances, maybe... look "through"
those fabrics - if they were thin enough.



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