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.
Energy cost
What will it cost to run?
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?
Cooling cost comparison
Window AC vs. portable AC: which costs less to run?
Laundry cost guide
How much does an electric clothes dryer cost to run?
Kitchen cost guide
How much does a dishwasher cost to run?
Comfort cost guide
How much does a ceiling fan cost to run all day?
Repair decisions
Repair it or replace it?
Appliance decision guide
Should you repair or replace an old refrigerator?
Appliance decision guide
Washing Machine Repair or Replace? Cost Calculator
Appliance decision guide
Should you repair or replace a clothes dryer?
Appliance decision guide
Should you repair or replace a dishwasher?
Appliance decision guide
Should you repair or replace an oven or range?
Cooling decision guide
Should you repair or replace a window air conditioner?
Outage planning
How long will backup power last?
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
What size power station will run a freezer overnight?
Medical-device outage planning
How long will a 500Wh power station run a CPAP?
Basement outage planning
Can a portable power station run a sump pump?
Outage comfort guide
How long will a power station run a television?
Work-from-home backup guide