If you have a drafty home, are always cold or just want to add some supplemental heat, there's an energy-efficient space heater fit for the job. When the temperatures drop, sometimes your furnace ...

The best space heaters quickly warm up a cold space. We tested 25 heaters in large and small rooms, examining warmth, energy efficiency, and safety.

CR’s thorough testing takes into account speed of heating, safety, weight, noise, and more. View our ratings and reviews and browse our buying guide to find the best space heaters.

The Smart Envi heater by eHeat does an admirable job with a few key functions, which is why if you’re in the market for a space under 150 feet, I recommend you purchase this one.

Next, determine the amount of time the heater will be in operation – usually in hours – and then convert the kilowatts used per hour by dividing the maximum wattage of the heater by 1 000.

Next, determine the amount of time the heater will be in operation – usually in hours – and then convert the kilowatts used per hour by dividing the maximum wattage of the heater by 1 000.

Since our central heat isn’t very efficient (it is itself kind of a giant space heater), I’ve assumed that the room-by-room approach is best. But our power bill soared last month, so I decided ...