Household guides
Start with the question you are trying to answer.
Each guide opens with a calculator configured for a common U.S. household scenario. Replace the sample numbers with your appliance, bill or battery.
Cooling cost guide
How much does a portable air conditioner cost to run?
Heating cost guide
How much does a 1,500-watt space heater cost to run?
Humidity cost guide
How much electricity does a dehumidifier use?
Ventilation cost guide
How much does a window fan cost to run all night?
Appliance decision guide
Should you repair or replace an old refrigerator?
Appliance decision guide
Should you repair or replace a washing machine?
Outage planning guide
How long will a portable power station run a refrigerator?
Connectivity backup guide
How long will a battery backup run a Wi-Fi router?
Outage planning guide