Use-case guide · 2026

Best heater for a Drafty Old House

In a leaky house, heating the air is a losing game — it escapes as fast as you warm it. The winning strategy is to heat people and zones instead: infrared that warms you directly, a heated mattress pad at night, one good heater in the room you're in, and the furnace set lower everywhere else. And an afternoon with weatherstripping and plastic window film beats any heater upgrade.

What this house needs

Heater size needed

1,500W per occupied room (zone heating), not whole-house

Type that fits best

Infrared cabinet + heated bedding

  • Infrared radiant heat doesn't care how leaky the room is — it warms the person in front of it. In a drafty room it feels far more effective than a fan heater of the same wattage.
  • Zone heating: heat the room you're in to 70°F and let the furnace hold 60–62°F elsewhere. That's the whole money-saving trick.
  • At night, heat the bed, not the bedroom. A heated mattress pad lets you sleep warm in a 58°F room.

Not sure what size you need? Run your room through the heater sizing tool →

Our picks

Before you buy

  • Before buying a second heater: weatherstrip doors, seal window gaps, add window film, and close off unused rooms. Cheap, and bigger than any heater upgrade.
  • Old wiring and space heaters are a risky combination. One 1,500W heater per circuit, wall outlets only, and if breakers trip or outlets feel warm, stop and call an electrician.
  • Knob-and-tube or two-prong outlets: get the circuit evaluated before running a heater on it.

Frequently asked questions

What's the best way to heat a drafty room?

Radiant (infrared) heat aimed at where you sit, plus reducing the drafts. Infrared warms you directly rather than warming air that leaks away, so it feels effective even while the room itself stays cool. Seal what you can first — the heater then has a fighting chance.

Is it cheaper to run space heaters than the furnace in an old house?

It can be, if you use them to zone-heat one or two occupied rooms while lowering the whole-house thermostat several degrees. Running multiple space heaters to heat the whole house is almost always more expensive than the furnace.

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