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Heat Loss and Insulation

Heat Loss Loft Insulation cavity wall insulation double glazing floor insulation lagging



Underfloor Insulation

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If you have timber floors, mineral wool insulation* can be used between the joists to insulate your floor.  Assuming this is the only insulation measure installed in your house you can reduce the amount of heat loss through your floor by about a half and can therefore reduce your energy bill by about 7 or 8%.

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Double Glazing

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Replacing your windows with double glazing to just save money does not actually make a lot of sense, you will reduce heat flow through you windows by at least a half and again assuming this is the only insulation measure installed in your house you should reduce you overall energy bill by between 5% and 10%.  For the smaller 3 bed house assuming you save the maximum 10% of your heating costs you should save  £ 60 each year if you are gas heated and if it cost about £ 5000 to install the windows the investment will payback in about 80 years.

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Household Energy Costs

Car Energy Costs

Site Guidance

All calculations on this site are based on current fuel prices they are checked regularly are automatically updated and were last changed on:-
1th February 2012
For complete clarity, all calculation using current fuel prices are coloured red.
The costs calculated based on these fuel prices should be regarded as 'good estimates', given that fuel prices vary in different parts of the county and at different time of the year.
The calculations also have different levels of accuracy depending on the nature of the calculation. For example calculating the energy use of a known power output TV is very easy compared to calculating the effect on energy savings when insulating a cavity wall.

Android Phone App

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We now have a bit of fun energy calculator app for android phone, click the link to find out more. Link to app

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Icons are also used throughout the site to indicate the level of saving or the relative cost implications associated with an choice you might make, or a tip you read or related to how your house is currently configured. These icons below.
pence lowest priority
£ 10+ Think twice, perhaps you should focus elsewhere first
£ 100+ Worth doing
£ 1000+ Focus your effort here to save as much money as possible

In some areas there are some substantial investments you may choose to make, in sections describing these we indicate with two icons, thumbs up or down, if the investment is a good one. Payback in less than 15 years is regarded as reasonable, but longer that that poor. These icons are below.
less than 15 years to payback investment
More than 15 years to payback the investment

Site Units

The main units used in this site are in the table below, For a complete explanation of any of these Wikipedia is an excellent resource.

Unit Name Detail
W Watt Unit of Power
kW Kilowatt 1000 watts
kWh Kilowatt hour Measure of Energy
L Litre Measure of Volume

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