Cycling and controls
Refrigerators, HVAC systems, heaters, and pumps turn on and off. Nameplate power multiplied by 24 hours usually overstates their daily energy.
Your environment
Room temperature, climate, water temperature, insulation, installation, and maintenance all influence energy use.
Use labels for comparison
Annual energy labels can compare models consistently. Plug meters, smart panels, and utility interval data can describe your own usage more directly.
Use the numbers
Apply this guide with one of WattMeasure’s free calculators. Results are planning estimates and should be verified for consequential decisions.
Last reviewed August 6, 2026