I'm toying with the idea of picking up a middle of the road Flir camera from Amazon ~$400 and using it to check for thermal leaks around windows and large garage doors. I wonder if a 256x192 model would be of much use for that purpose? Would a less expensive option still work?Cheap can be ok. Thermal cameras are not magic though. The cheaper cameras have lower resolution (and cheaper still only have accurate temp at center spot). Both of those are ok for this application. You don't care about calibrated temperatures, just differences and lower resolution means you need to be closer to the wall when scanning to get the detail you want. Not a big deal for a home-gamer. If you are shooting far by necessity (eg tall ceiling or industrial plant) or if you are selling time (scanning a whole wall in a second instead of a minute), better cameras can make sense.
Also thinking of using it to check the effectiveness, or at least uniformity of attic insulation. House I bought has a 35x50 shop with 12' ceilings. Fully insulated, including the attic. I'd like to check it, but it's a PIA to enter the access hatch. Thought if I looked upwards onto the ceiling from the warm shop that any thin or poorly insulated spots should show up quite clearly.
Same goes for the 4x 10x8' doors. I could climb up a ladder and run my hand over the seal to check for leaks, or I could use technology to free up that hand to hold a beer.
I don't have any drafts or obvious issues, just looking to eek out any and all efficiency that I can.
House also has 46 exterior windows, so lots of seals to check there too.