Electrical useage? Unless you have four 1k-watt lights going, so what? My computer uses damn near as much energy as a 1k light. My window air conditioner unit uses probably two 1k lights worth of energy. My microwave uses 1.5 lights worth. ALL of these things generate heat too. As long as you pay your electric bills on time, and don't have more than four 1k lights going, the electric company isn't going to notice or care.

As for thermal imaging, they can ONLY use the results from thermal imaging AFTER they have obtained a warrant -- the Supreme Court has already ruled that thermally imaging someone's home without a warrant is a 'warrantless search', and thus illegal. (This only applies in the U.S.) If they already DO have a warrant, then you had other problems before you were ever imaged, obviously. And if they already have a warrant to search your house, they'll do it with guys on the ground and be a lot more thorough (and destructive) in their searching than any helicopter imaging search could ever be.