How Much Does It Cost to Run a Portable Air Conditioner? (UK 2026)
Based on the active UK Ofgem price cap of 24.5p per kWh (1 January 2026 – 31 March 2026).
A typical 1100W portable air conditioner costs £0.27 per hour of continuous use at current UK electricity rates (24.5p/kWh). For typical daily usage (5 hours daily during summer heatwaves (~5.5 kWh/day)), it costs approximately £1.35 per day or £493.03 per year.
Manufacturer specs: De'Longhi Pinguino & AEG ChillFlex Pro 9,000–12,000 BTU portable air conditioner fiches
* Includes 1.5W standby consumption outside active hours (£2.54/year).
How to Save Money Running a Portable Air Conditioner
- Seal the window exhaust hose tightly using an insulated window seal fabric kit so hot outside air does not leak back into the room.
- Set the thermostat to 23°C–24°C rather than 18°C; every degree lower increases compressor power consumption by 8% to 10%.
- Close blinds and curtains during daytime hours to block solar radiation before turning on the air conditioner.
- Clean the washable dust filters every week during heatwaves; clogged filters restrict airflow and force the compressor to overwork.
Alternative Appliances Compared
vs. Desk / Standing Fan
View running cost →A fan consumes 45W versus 1100W for an air conditioner, costing 95% less to run on moderately warm days.
vs. Dehumidifier
View running cost →In humid weather, removing moisture with a 300W dehumidifier makes air feel significantly cooler without running a 1100W compressor.
Portable Air Conditioner Technical Power Profile
Source data: De'Longhi Pinguino & AEG ChillFlex Pro 9,000–12,000 BTU portable air conditioner fiches
Frequently Asked Questions: Portable Air Conditioner Electricity Costs
How much does it cost to run a portable air conditioner for an hour in the UK?â–¾
An 1100W portable air conditioner running at full compressor load consumes 1.1 kWh. At 24.5p/kWh, this costs approx. 27.0p per hour (approx. £1.35 for a 5-hour afternoon session).
Why are portable single-hose air conditioners less efficient than split systems?â–¾
Single-hose portable units blow indoor air over the condenser coil and out the window, creating negative pressure that pulls warm outside air into the house through door cracks and vents.
How much does running an AC for 30 days of summer cost in the UK?â–¾
Running an AC for 6 hours a day over a 30-day heatwave consumes approx. 198 kWh, costing around £48.50 for that month.
What size air conditioner (BTU) do I need for a bedroom?â–¾
A 9,000 BTU unit is ideal for bedrooms up to 20 m² (approx. 200 sq ft). Larger living rooms (30 m²) generally require 12,000 BTU.
Does using "Dehumidify Mode" save electricity on an AC unit?â–¾
Only slightly. The compressor still runs to cool the evaporator coil, though fan speeds are typically pinned to the lowest setting.