Energy

Estimate an appliance's monthly and annual electricity cost from measured or rated power, runtime, duty cycle, standby use and your local rate.

Estimate battery charge time across a chosen state-of-charge window using charger limits, efficiency and taper plus realistic derating and overhead.

Match a ceiling fan to room area and height, then verify physical fit and airflow performance plus location safety and annual running cost.

Estimate dehumidifier capacity from room size and moisture conditions, then compare portable-unit tiers with drainage and energy needs.

Estimate dwelling electrical service demand from general and major loads, then compare the result with the entered rating and headroom target.

Size generator running and starting wattage from a load inventory, with startup overlap and site-derating assumptions for equipment comparison.

Estimate heat pump operating savings and simple payback using fuel use and seasonal efficiency, with utility rates and backup heat included.

Estimate annual LED energy and bill savings from your lighting schedule, then compare upgrade cost, simple payback and long-term net benefit.

Estimate your annual carbon footprint against a chosen budget, compare major sources, and test local emission factors or verified offsets.

Estimate propane burn time from tank fuel and appliance BTU load, then check reserve-adjusted runtime, fuel cost and limited vapor flow.

Estimate how many solar panels fit one roof face after pitch, setbacks, keepouts, frame gaps, and orientation, then screen DC size and annual energy.

Estimate solar module count and DC array size from electricity use, sun hours, losses, available area, and optional inverter sizing.

Estimate rooftop solar cash payback from net cost and annual energy value, including tariff treatment plus degradation and maintenance assumptions.

Estimate annual standby energy cost from measured watts and schedules, then test cuttable savings with payback plus bill and emissions context.

Size storage and tankless water heaters from peak-hour volume, overlapping fixture flow and temperature rise with reserve and install checks.

Compare current and proposed whole-window U-values, then estimate conductive heat-flow and seasonal differences with consistent unit conversion.