Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Heat Pump Savings Calculator (vs Gas or Oil)

Compare the annual heating cost of a heat pump against a gas or oil furnace using your heat demand, the heat pump's COP, furnace efficiency, and both fuel prices.

Annual heat demand (delivered) (kWh/yr)

Heat pump COP (seasonal average)

Electricity price ($/kWh)

Furnace / boiler efficiency (%)

Fuel price (per kWh equivalent) ($/kWh)

Solar Energy

Solar Carbon Offset Calculator

Estimates the annual CO2 emissions avoided by your solar PV system, using your yearly production in kWh and the grid emission factor it displaces. Useful for sustainability reports, REC quantification, and household carbon-footprint dashboards.

Annual Solar Production (kWh)

Grid Emission Factor (kg CO2/kWh)

Key differences

	Heat Pump Savings Calculator (vs Gas or Oil)	Solar Carbon Offset Calculator
Category	Solar Energy	Solar Energy
Inputs required	5	2
Result	Annual heating savings ($/yr)	Annual CO2 Reduction (tonnes)
What it does	Compare the annual heating cost of a heat pump against a gas or oil furnace using your heat demand, the heat pump's COP, furnace efficiency, and both fuel prices.	Estimates the annual CO2 emissions avoided by your solar PV system, using your yearly production in kWh and the grid emission factor it displaces. Useful for sustainability reports, REC quantification, and household carbon-footprint dashboards.