Cooling
Air conditioning cost
Enter the AC power draw, daily hours, cooling days, and electricity rate to estimate the monthly cost.
Monthly AC cost$39.31218 kWh used
Daily AC cost$1.51on cooling days
Yearly if repeated$471.74same usage all year
AC cost calculator for renters
Find the cheaper way to cool a rented room.
CoolBill helps renters estimate what a window, portable, or split AC could add to the monthly electricity bill before running it every night.
Monthly cooling$39.31
editableAC
Cooling calculator
Estimate AC cost from watts, hours, days, and your electricity rate.
Assumptions
Set the calculator to match the room you actually cool.
Room size matters
A small bedroom and a sunny living room can behave very differently. Use the wattage from the actual unit label when possible.
Use bill-rate math
If your bill has tiered or time-of-use pricing, start with the rate that applies during the hours you usually cool the room.
Ignore landlord promises
Use this as a neutral estimate before agreeing to split utilities, buy a portable unit, or run the AC overnight.
Renter checks
Questions to answer before running the AC all night.
- 01Window unit or portable unit?
Compare the expected monthly cost of the exact wattage printed on each unit.
- 02All night or timed cooling?
Change daily hours from 8 to 4 and see whether a timer meaningfully lowers the bill.
- 03Shared utilities?
Use the monthly estimate as a starting point for a fair roommate or landlord conversation.