Running costs · ONEHUB AIR CONDITIONING
How much does air conditioning cost to run?
Running cost equals electricity used in kWh multiplied by your electricity unit rate. Use electrical input, not the cooling-capacity label. Actual consumption changes as the system modulates and with weather, set temperature, room load and operating hours.
How do I calculate the electricity cost?
Cost (£) = electrical input (kW) × running time (hours) × electricity rate (£/kWh). For example, an assumed average input of 0.5 kW for four hours uses 2 kWh. At an illustrative 30p/kWh, that costs 60p.
The rate below is an example, not a current tariff quote. Replace it with your own unit rate. These calculations assume a constant average input; they do not predict how a particular system will perform in your room. Standing charges are not included.
| Assumed average electrical input | One hour at 30p/kWh | Four hours at 30p/kWh |
|---|---|---|
| 0.3 kW | 9p | 36p |
| 0.5 kW | 15p | 60p |
| 1.0 kW | 30p | £1.20 |
Why does the input vary?
Inverter-controlled equipment adjusts its output as demand changes. Bringing a hot room down to temperature can require more work than maintaining it afterwards. Outdoor temperature, solar gain, insulation, open windows and doors, and the chosen setting all affect the load.
A catalogue rating is measured under specified conditions. Seasonal efficiency figures help compare products, but they are not a promise that a unit will draw the same power every hour. A plug or circuit meter suitable for the installation, or reliable equipment energy data, can give a better picture of actual use.
Can air conditioning provide heating as well?
Many fixed air-conditioning systems are reversible air-to-air heat pumps and can heat as well as cool. Heating performance and electrical input vary with outdoor conditions and the selected model. Defrost operation can also affect performance in cold weather.
Do not assume heating is always cheaper than an existing boiler or other system. Compare useful heat delivered, your actual fuel rates, equipment efficiency and the rooms you intend to heat. We can help select equipment, but cannot promise a bill saving without those details.
What practical steps help avoid wasted energy?
Choose an appropriately sized system, keep airflow unobstructed, maintain filters according to the manual and arrange appropriate professional servicing. Use sensible schedules and close unnecessary openings while the AC is conditioning the room.
Before buying, compare a suitable installation and scope as well as running costs. A cheap unit with an unsuitable capacity or poor location may not deliver the comfort you want.
Common questions
Does 3.5 kW cooling capacity mean 3.5 kW of electricity?
No. Cooling output and electrical input are different quantities. Use actual or appropriate rated input data when estimating electricity cost.
Are the examples a guarantee of my bill?
No. They demonstrate the calculation only. Your tariff, usage, room and operating conditions determine the cost.
Plan the right system for your space.
Speak to OneHub about your home or business in Dartford, Kent, London or the wider South East by arrangement.