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A comment on Homemade thermal camera. Parent comment

Re:Homemade thermal camera by luser001 on Sunday October 14, 2012 @09:17PM (#4653258)
AFAIK, most houses (not apartments) in the US have forced air circulation systems along with heating. Basically this means a fan will suck air out of the house and push air from outside, even with all windows closed.

So your advice is likely wrong for a lot of people. YMMV.

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Re:Homemade thermal camera by chrisbennet on Monday October 15, 2012 @08:24AM (#4654738)
Forced hot air systems get their air from inside the house via the "cold air return", then they heat it or air condition it then pump it out the vents. Nothing comes from outside.

IMO A few air leaks is not a bad thing as they provide some nice fresh air.

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