A heat pump with COP 3.5 uses 65% less energy than electric resistance heating.
Air-source heat pumps save $500–$2,000/year vs gas heating in most climates.
Reach for this calculator when precision matters more than rough approximation — whether that is for a financial decision, a planning task, or simply getting the right answer the first time.
Many errors with practical calculators arise from not reading the result in context. A number without units, without scale, or without comparison against a reference range is hard to interpret correctly.
A traveller converts currency amounts for a trip budget, checking live rates against historical averages to understand whether the current rate is favourable or whether it makes sense to exchange at a different time.
vs electric resistance: 60–70%. vs gas: 20–50% depending on gas price and efficiency.
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