Refrigerators run their compressor intermittently to maintain cold temperature, averaging 150–600 watts depending on age, size, and insulation. Because they run 24/7, they're typically a home's largest constant electrical load.
| Basis | Cost |
|---|---|
| Per hour (while running, 150 W typical) | $0.028 |
| Per day (24 h/day, 7/7 days) | $0.68 |
| Per month | $20.63 |
| Per year | $247.60 |
| Hourly range (small 100 W – large 250 W) | $0.019 – $0.047 |
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