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This depends on alot of factors. The R value (insulation value) is different for hollow doors , wood doors metal etc. Also a window in the door whether or not it is single payne glass. Most older entry doors are wood or metal. Alot of the metal doors do not have insulation which makes them very bad for your insulating factor. A solid old wood door is actually better rated than a newer steel door with no insulation. The only way to really tell you heat loss would be to hire HVAC to do load calculations and refer to charts to compare what you have in your home to models that have been tested for their R value. As long as all the seals around the door are ok and there are no gaps from missing weatherstrip or sweep missing there is not usually a large heat loss. If you have a non insulated steel door , you might as well leave it open because they have little or no R value. Solid wood does carry a little insulating factor

One of the important factors in measuring heat loss is identifying where the heat loss occurs. While the door itself can lose heat (as can a badly insulated wall it is attached to) the main problem is in ill fitting doors. Shut the door and hold a piece of tissue paper just in front of the sides and base of the door, if it moves then you have air flow. Stopping air flow will dramatically decrease heat loss. The most popular products used in professional buildings are acoustic door packs, these provide a perimeter and drop down seal pack which can be easily fitted to all sides of the door. Rated upto 51dB they provide sound proofing and excellent insulation. Standard draught excluders can drag on the floor and wear out easily while damaging carpets etc.. The drop down seals only drop to the floor when the door is closed.

All internal doors can be fitted with these seals (either in rebate or retrofit, ie with or without taking the door off its hinges) and they can be sourced for around £ 25.00 per pack. To find the products online just search for drop down door seals on Google.

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Q: What percentage of heat is lost through doors of houses?
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