I don't think that would work for the type of use you are looking for. Basically the sensor on a standard digital camera doesn't pick up infrared well enough to do thermal imaging. It works for reflected infrared light, but the kind you're talking about requires a much more sensitive device.
You're looking for something like a
thermal imaging camera, it may be better off hiring someone who has this sort of device to do a survey of your home, or if possible rent one?
Also your digital camera isn't going to give much color variation to the different "temperatures" like a real thermal imaging camera would, and that's even if it did pick up enough infrared from your house to show an image.