presta
Guru
I did see something about some local governments having infra-red camera things for hire to check on how your house is leaking heat
no idea how to get hold of one - or if it might be worth it
£70 a day to hire, or buy one from £180. At that price, buying looks a better bet than hiring, especially if you can share the cost with a few neighbours.
If you're willing to settle for spot measurements instead of video, it's much cheaper, although when I bought one of those a few years ago it packed up after about 20 minutes use.