Portable space heaters convert nearly all electricity to heat, so their energy draw matches their wattage (typically 750–1,500 watts) continuously while running. Using one to heat an entire home instead of relying on central heat usually costs more, not less.
| Basis | Cost |
|---|---|
| Per hour (while running, 750 W typical) | $0.14 |
| Per day (6 h/day, 7/7 days) | $0.85 |
| Per month | $25.79 |
| Per year | $309.49 |
| Hourly range (small 400 W – large 1500 W) | $0.075 – $0.28 |
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