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What are the spots?carbon dioxide emissionsfuel costs They show the relative Cost Savings and Reduced CO2 emissions.

Each Year
Each Year
Each Year
dishwasher energy saving tips Dishwashers
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30kWh -
£4.62 -

11.01kg -

Run the machine full and less often

boil less water in kettle energy saving tips Boiling Water
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82kWh -
£12.628 -

30.09kg -

Boil only what you need. Savings depend on how much tea you drink!

fridge freezer energy saving tips Fridge Freezers
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50kWh -
£7.7 -

18.35kg -

Fridge maintenance. Savings depend on size, age and rating

dmoney saving tips tumble drying Tumble Dryers
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90kWh -
£13.86 -

33.03kg -

Operate Less often, clean filters, part dry clothes?

differnce in cost of shallow or deep bath Baths
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700kWh -
£30.1 -

147kg -

Have shallower baths and consider how you heat water

change energy supplier to save money Change Supplier
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0kWh -
£0 -

0 -

save money and have a beerSwitch! This is the single simplest way of saving money. This is equivalent to 100 pints of beer!

shower or power shower which is cheaper Shower of Power Shower
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120kWh -
£18.48 -

25.2kg -

Aviod immersion heated power showers

save money and energy with good loft insulation Install Loft Insulation
Read More
3000kWh -
£129 -

630kg -

Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

save money and energy with good loft insulation Improve Loft Insulation
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1000kWh -
£43 -

210kg -

Modern loft insulation in a 3 bed semi - these numbers are for Gas, savings are greater for other fuels

This table is under construction there are more tips here.

Measures to reduce fuel bills: ROI* is the time it takes in years to return the investment in fuel savings for an average gas heated 3 bed semi-detached house.
Measure ROI*
hot water tank insulation save energy save money Lagging 1 Year
loft insulation energy saving Loft Insulation 2 Years
cavity wall insulation energy saving Cavity Wall Insulation 2.3 Years
underfloor insulation energy saving Underfloor Insulation 4.4 Years
solid wall insulation energy saving Solid Wall Insulation 15.8 Years
double glazing energy saving Double Glazing 58.1 Years
Renewable Energy Measures ROI** is the time it takes in years to return the investment in energy. The table assumes no government incentive schemes are used (FIT or RHI).
Measure ROI**
solar hot water energy saving costs Solar Hot Water 11 to 62 Years
ground source heat pump investment costs Heat Pumps 4 to 81 Years
domestic wind power costs Wind Power 16 to 32 Years
solar PV costs and investment Solar Photovoltaics 13 ± 3 Years

Air Conditioning

Last Updated on Thursday, 06 April 2017 15:34

how much does it cost to use an air conditioner

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.

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:-

£0.462 and by using it you will have emitted:-

1.1kg CO2 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 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.

Simply enter your own values below

Hours Used Per Day: 

Power Use (Watts): 

Price Per kWh: 

Cost Per Hour: 

Cost Per Day: 

Cost Per Month: 

Cost Per Year: 

kWh Per Day: 



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