Heating and cooling BTU needs based on room size, insulation, and climate zone.
Correct wire gauge for amperage, distance, and voltage drop requirements.
Pipe diameter for target flow rate and pressure based on fixture count.
Tank or tankless water heater capacity for your household demand.
Monthly and per-mile charging cost for your electric vehicle at home or public stations.
Heat pump sizing, energy savings, and payback period versus furnace or AC.
Identify energy waste and estimate annual savings from insulation, sealing, and upgrades.
Calculate kilowatt-hour usage and monthly cost for any appliance or circuit.
System size, output, and savings for residential solar by roof area and sunlight.