Energy

Estimate one appliance's monthly and annual running cost from watts, amps, annual kWh, runtime, standby draw, rates, and usage checks.

Estimate battery charge time from capacity, SOC window, charger or source cap, taper behavior, C-rate guidance, deadline fit, and energy cost.

Choose a ceiling fan size from room area, airflow target, ceiling height, moisture rating, clearance, downrod guidance, and run-cost checks.

Size a dehumidifier for damp rooms from area, humidity, temperature, drainage, runtime, bucket handling, and energy-cost estimates.

Estimate home electrical service demand in amps from floor area, appliances, HVAC, EV charging, and added loads with target headroom checks.

Estimate generator running and starting watts from load rows, surge timing, reserve, derating, and safety checks before choosing a size.

Estimate heat pump savings from fuel use, COP or HSPF2, utility rates, incentives, backup heat, and simple payback timing for bids.

Estimate LED lighting savings from old and replacement watts, runtime, rates, rebates, and install costs, with payback and fixture checks.

Estimate an annual carbon budget from home energy, travel, diet, other sources, and offsets with runway and reduction-lever views.

Plan propane tank runtime from tank size, fill level, BTU load, reserve, daily use, fuel cost, and vapor-flow checks before refills.

Estimate how many rooftop solar panels fit after setbacks and keepouts, then compare DC kW, annual kWh, target size, and layout warnings.

Estimate solar panel count and DC array size from bill kWh, sun hours, losses, module watts, roof area, and inverter ratio checks.

Estimate when rooftop solar savings repay net upfront cost with incentives, export-credit rules, degradation, and annual cash-flow checks.

Estimate yearly standby power cost from watts, schedules, rates, and cuttable loads, with savings, payback, bill-share, and CO2 context.

Size a storage or tankless water heater with peak-hour draws, fixture overlap, temperature rise, reserve, and install checks before comparing models.

Compare current and proposed whole-window U-values, estimate conductive heat-flow savings, and flag target, SHGC, and label limits.