They may not be powerful enough to heat large, drafty rooms on their own, but portable heaters are good for saving energy if you use them to heat only the room you are in, and turn the temperature down in other rooms. They also work well as personal space warmers while you read or watch TV.

The model from Holmes, a 15-inch mini-tower, produced the hottest air and took only about 20 minutes to warm up the room by 10 degrees. It can be set to either high or low, or to a specific temperature between 60 and 80 degrees, in increments of 5 degrees. As the grill heats up, it changes color to remind you that it is hot, which is good because it’s not one you want to touch.

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