If it falls within your budget, Dyna-Glow’s 10,000-watt Electric Garage Heater offers unbeatable heat output. It emits 34,121 BTUs, which heats rooms as spacious as 1,000 square feet.

1. Using a heater that's the wrong size for the room With so many different types of electric heaters on the market, it's no surprise that they're not a one size fits all.