Go around the house and look at all your outlets. You’ll find that GFCI outlets put out a small amount of heat. (Something to do with their function that is unavoidable.) Regular outlets that are warm and under no load may require investigation.
You can also spot heating conduits in walls, roughly figure out what power adapters are not very efficient, and even use them to gauge how well heated blankets and the like are working. I used mine to look at studs in the wall to figure out (well, be certain about) how some old renovations were handled.
Go around the house and look at all your outlets. You’ll find that GFCI outlets put out a small amount of heat. (Something to do with their function that is unavoidable.) Regular outlets that are warm and under no load may require investigation.
You can also spot heating conduits in walls, roughly figure out what power adapters are not very efficient, and even use them to gauge how well heated blankets and the like are working. I used mine to look at studs in the wall to figure out (well, be certain about) how some old renovations were handled.