How Much Does It Cost to Run a Portable Air Conditioner in the UK?

Portable cooling does not necessarily mean a frightening electricity bill. Using a 1.3kW portable air conditioner and an electricity rate of 25p per kWh as an example, the running cost would be approximately 33p per hour.

Even if that machine drew its full rated input continuously for an eight-hour working day, the example cost would be about £2.60—roughly the price of one takeaway coffee for a full day of cooling.

The exact figure depends on the machine, your electricity tariff and how often the compressor needs to run, but the calculation is straightforward.

How much does a portable air conditioner cost per hour?

Check the unit’s specification label or manual for its electrical power input, shown in watts (W) or kilowatts (kW). Do not confuse this figure with its BTU rating or cooling capacity.

Power consumption in kW × electricity price per kWh = maximum hourly running cost

For example:

• Portable air conditioner power input: 1.3kW
• Example electricity rate: 25p per kWh
• Maximum hourly cost: 1.3 × £0.25 = 32.5p
• Eight hours at full rated input: approximately £2.60

Put simply: in this example, an hour of proper refrigerated cooling costs around 33p.

These figures are illustrative rather than a fixed promise. Use the power input shown on your machine and the unit rate on your latest electricity bill for your own calculation.

Does a portable air conditioner constantly use full power?

Not necessarily. Once the room approaches the selected temperature, the compressor may cycle on and off while the fan continues to run. This means real-world consumption can be lower than a calculation that assumes the compressor operates continuously at full rated input.

Actual consumption will depend on:

• The room size and ceiling height
• The outdoor temperature
• Direct sunlight through windows
• The building’s insulation
• The number of people in the room
• Heat produced by computers and other equipment
• The selected temperature
• How effectively the exhaust opening is sealed

An undersized or poorly installed unit may need to work for longer to reach the desired temperature.

How can you reduce the running cost?

• Choose the correct BTU output for the room.
• Keep doors and windows closed while the unit is cooling.
• Close curtains or blinds where direct sunlight enters.
• Seal the opening around the exhaust hose as effectively as possible.
• Clean the filters in line with the manufacturer’s instructions.
• Avoid setting the temperature unnecessarily low.
• Start cooling before the room becomes excessively hot.
• Keep the exhaust hose short, unrestricted and correctly positioned.

The heat removed from the room must be expelled outside. If the exhaust is not set up correctly, the unit will cool less effectively and may need to run for longer. Read our guide: Do Portable Air Conditioners Need a Window?

Is hiring better than buying?

Hiring can make commercial sense when cooling is required for a hot spell, an event, a temporary project or while a fixed air-conditioning system is unavailable. It avoids buying equipment that may only be needed occasionally.

UK Building Supplies offers 12,000 BTU portable air-conditioning hire in seven-day periods, subject to availability and supplier coverage.

If you are unsure about capacity, use our guide: What Size Portable Air Conditioner Do I Need?

The practical answer

Portable air conditioning gives you genuine refrigerated cooling for a relatively modest hourly cost. In the example above, it is around 33p per hour—or approximately the price of one takeaway coffee for an eight-hour day if the unit operated continuously at full rated input.

Correct sizing, sensible temperature settings and a well-sealed exhaust arrangement can help the unit cool the room more effectively. If you need temporary cooling, view our portable air-conditioning hire option.