September 14, 2026
How much does it cost to run a portable air conditioner?
Kısa cevap
A 12,000 BTU portable air conditioner typically draws 1,200-1,500 watts — noticeably more than a window unit of the same BTU rating, because a portable has to run its own exhaust hose and loses some efficiency venting through a window kit. Run 8 hours a day, that's about 10-12 kWh, or roughly $1.70-2.00 a day at the 2025 U.S. average rate of 17 cents per kWh — about $50-60 a month. In a high-rate state like New York or California it can run $80-100 a month for the same usage. Enter your own state and hours below for an exact number.
Portable air conditioners are popular for a reason: no bracket, no landlord sign-off, roll it between rooms. But BTU for BTU, they're the least efficient way to cool a room — and that shows up on your bill.
Why a portable unit costs more than its BTU rating suggests
A window AC puts its entire hot side outside your living space. A portable unit sits inside the room, venting hot exhaust air through a hose to a window kit — and it has to pull in outside air to feed that exhaust, some of which is warm, humid air leaking back in around the kit. The compressor compensates by running harder and longer than a window unit rated at the same BTU. In practice, a "12,000 BTU" portable often cools like an 8,000-9,000 BTU window unit while drawing more watts.
What that means in power draw
- 8,000-10,000 BTU portable: 900-1,100 watts
- 12,000-14,000 BTU portable: 1,200-1,500 watts
- Dual-hose models (draw intake air from outside instead of the room) are meaningfully more efficient than the common single-hose design, if you have the option
A worked example
A 12,000 BTU single-hose portable at 1,300 watts, running 8 hours a day for 30 days:
- Daily: 1,300 W x 8 h = 10.4 kWh -> about $1.77 at 17 cents/kWh
- Monthly: 312 kWh -> about $53
- Over a 3-month cooling season: roughly $160
Swap in a window unit at the same 12,000 BTU rating and the same routine typically runs $10-15 less a month, simply from the efficiency gap.
When a portable is still the right call
If you're renting and can't install a window bracket, or you need to move cooling between rooms through the day, the extra cost is usually worth the flexibility. Sizing it correctly for the room and keeping the exhaust hose as short and straight as possible both help close the gap.
Run your own numbers
The calculator below uses your state's current residential electricity rate. Set the BTU size and your actual hours and days to get daily, monthly and yearly cost. To compare against a window unit on the same rate, see our window AC cost guide or the main AC calculator.