Heat pump
A year’s space-heat demand from floor area and a rough insulation class, then electricity at a chosen SCOP versus gas.
Open a calculatorHeat loss through a surface
kWh = U × area × temperature difference × hours / 1000. U is W/m²K. A 1.1 window is a typical double pane; a 2021 wall is far lower. Wind, thermal bridges and solar gain are not in the figure.
Thermal transmittance in W/m²K — a 1.1 window is a typical double pane; a 2021 wall is far lower.
Thermal transmittance in W/m²K — a 1.1 window is a typical double pane; a 2021 wall is far lower.m²
Indoor minus outdoor temperature difference — often about 20 K in the heating season.
Indoor minus outdoor temperature difference — often about 20 K in the heating season.K
Hours per year at that ΔT — 5000 is a rough heating season, not your weather file.
Hours per year at that ΔT — 5000 is a rough heating season, not your weather file.Cost of that loss
1,980 zł
Heat lost
2,200 kWh
Cost of that loss: 1,980 zł
5000 hours at 20 K is a rough heating season, not your weather file.
Recent on this tool
Full historyThis list is the copy in this browser. Click a result to reopen those fields. The server copy sits behind the site owner's PIN.
No results yet. Use a calculator — the first reading appears here.
An educational estimate. Not medical, tax or credit advice.