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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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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.
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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.
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More than 15 years to payback the investment

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Site Guidance

All calculations on this site are based on current fuel prices they are checked regularly and were last updated on:-
                 28th December 2008
All calculation using current fuel prices are coloured red
The costs calculated for energy use based on these fuel prices should be regarded as 'good estimates' given that there are a variety of different fuel prices on offer in the country.
The calculations in the site 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 when to calculating the effect on household costs with insulating your cavity walls.

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