Thermal imagers are not cheap. But they do enable you to see in the dark and view things normally not possible with the naked eye. The FLIR ONE Thermal Imager happens to be an affordable solution that turns iPhone 5s/5 phones into a thermal imaging device. It can be used for security, home repairs, outdoors, and anything in between.
The device and its companion app let you detect leaks, find moisture, and identify other problems around your home. You can get yours for under $350 at this time.