Electric resistance heaters, outside, at the hotel. I guess the towel- and sheet-reuse program makes room for this kind of thing. (Nice place, though.)

"Saying that electric heating is 100 percent efficient is like saying that a Cadillac is 100 percent efficient because it burns up all the gasoline pumped into it."  —Lawrence Solomon, quoted in the 1993 book

Greenhome, by Wayne Grady. Read the EBN review.