Sulu made a face as Ianto laughed at his question, though he was taking it in good humor. "Hey, I don't know what you have, that's why I asked." He simply hadn't realized that central heating wasn't universally installed in this era, and he felt a little stupid for having assumed it, considering the state of the flat and the neighborhood in general.

Really, though, sweltering wouldn't be so bad, he imagined. After all, he could deal with heat; it was Ianto's comfort he was worried about. He blinked at the suggestion John had offered, considering it for a few moments. That was a decent idea, really. Ianto seemed a little hesitant about the idea, or maybe he just didn't think it would do any good. "But what?" he asked, prompting Ianto to continue.