A: Boy, it's chilly outside, isn't it? B: It sure is. A: In fact, it's chilly in the apartment, too. B: Let's turn on the heat. A: I'll check to make sure that all the windows are shut. B: It should be warmer in a few minutes. A: It's so nice to have a heated apartment. B: How did they survive in the old days? A: They had fireplaces. B: Someone had to chop the wood. A: And carry it into the house. B: All we have to do is flip a switch.