How much does it cost to run an air conditioner?
This is an almost impossible general question to answer as it depends on so many different factors, also you may be just wondering how to cool your house down a bit, .
Here are a few
- The powers consumption of the air conditioning (AC) unit.
- How hot it is and the temperature you want it to be, the temperature the thermostat is set for.
- The volume of space you are trying to cool.
- Whether a door or window has been left open to the area you are trying to cool.
- How readily the space you are cooling heats up with windows, and roof building materials.
- How well serviced the unit it.
I live in Northern England where the use of air conditioning is almost non existant, the temperature of my home town often sends me abroad to warmer climates, especially Spain and Greece. So my knowledge of cooling comes mostly from holidays, and I know how expensive it can be. I did also have to fit out a loft office in a factory with AC, many years ago. Some bright spark decided that a roof was a great place for the research scientists. Prior to the AC we all snoozed in the afternoon in the summer because of heat exhaustion and the management wondered why our productivity had reduced; apologies for the sentiment, but they were morons. I remember at the time doing a cost justification for AC based on the research group sleeping in the afternoon, that was fun!
So I'm going to keep this very simple. Consider an AC unit that has a power consumption of 3kW and is on for just 1 hour this will cost with the current UK electricity rate:-
£0.561 and by using it you will have emitted:-
1.1kg CO2e into the atmosphere.
This example is of a small unit, such a unit might be suitable to cool a single room on a hot day. Costs might reduce using it for longer if the thermostat temperature has been reached.
I have also tried several on line calculators to work out the AC requirement, to my mind they were all completely nonsensical. Some of them do not understand what power is or energy, they quote results in kW/h, this is the same as saying kj per second per second. Should they be using power consumption kW or do they mean energy required kWh, an example is on this web site http://cleanair.co.uk/btu-calculator/ Unfortunately I cannot recommend any of them, the calculation output makes no sense.
So Try this calculator it is crude, it only considers the equipment being on at 1 power rating, but it might give you an idea of costs.
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