Oz07 Posted June 26, 2019 Share Posted June 26, 2019 Could someone please quantify in laymans terms the real world difference of a wall u value between .18 and .2 for me? Single storey dwelling with around 90m2 of walls exc apertures. It's the difference of 25mm on chosen wall make up and I think the gain of 25mm would be better. Link to comment Share on other sites More sharing options...
epsilonGreedy Posted June 26, 2019 Share Posted June 26, 2019 Just a hunch... £20 to £40 p/a. Link to comment Share on other sites More sharing options...
Mr Punter Posted June 26, 2019 Share Posted June 26, 2019 It works out as 1.8 watts for each degree of temperature difference, so assume the average difference is 10 degrees, your poorer U value would lose 18 watts. Over a year that would be 158kWh, which will probably cost between £8 and £20 depending on fuel type. Link to comment Share on other sites More sharing options...
A_L Posted June 26, 2019 Share Posted June 26, 2019 @Oz07 as http://forum.buildhub.org.uk/topic/10204-would-you-notice-much-difference-020-versus-017-u-value/?tab=comments#comment-172917 so about 1.2kWh/m2 per year Link to comment Share on other sites More sharing options...
Oz07 Posted June 26, 2019 Author Share Posted June 26, 2019 Sorry missed that thread last week Link to comment Share on other sites More sharing options...
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