Shorter portable-heater use
A two-person household wants to know the difference between running a portable heater for three hours and two hours each evening.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Power unit | W |
| Power | 1500 |
| Hours per day | 3 |
| Days or equivalent sessions | 30 |
| Duty cycle (%) | 100 |
| Energy price (USD per input kWh) | 0.22 |
| Alternative power (W) | 1500 |
| Alternative hours per day | 2 |
| Alternative duty cycle (%) | 100 |
Baseline: 1500 ÷ 1,000 × 3 × 30 × 100% = 135 kWh. Alternative: 1500 ÷ 1,000 × 2 × 30 × 100% = 90 kWh. Multiply both by 0.22; the baseline minus the alternative is USD 9.90.
Modeled difference · USD 9.90
What the comparison shows
The estimated energy charge moves from 29.70 to 19.80. The difference reflects one fewer hour of draw each day.
Assumptions and limits
If a thermostat cycles, measure average power or enter a representative duty cycle. Heating elsewhere can offset the reduction.