Um. Ummm. Ummmmmmmmmm.

Tobias thought super hard about that. Except for the fact that he kind of... didn't. Because he knew a possible answer and it also related to that muggle studies lab that worked in the school. Sooooooooooo he raised his hand.

"They use heaters and stuff. But also there are some kinds of things that give off heat that they use, like computers and game systems and stuff and in winter and stuff, when you're inside, they work just as good as heaters AND they're a way to pass time too."

See? He knew his stuff.