Estimate what running a window or portable AC costs monthly.
The unit's wattage is multiplied by run hours and divided by 1,000 to get kilowatt-hours, which times the rate gives cost. AC is often the largest summer electric load, so its true cost changes choices about settings, size and insulation.
Air Conditioner Running Cost
kWh = watts x hours / 1000; daily cost = kWh x rate
kWh = watts x hours / 1000; daily cost = kWh x rate The unit's wattage is multiplied by run hours and divided by 1,000 to get kilowatt-hours, which times the rate gives cost.
AC is often the largest summer electric load, so its true cost changes choices about settings, size and insulation.
This calculator takes 3 inputs: Power, Hours per day, Electricity rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.