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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Heating and cooling: Over heating from south facing windows

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    Hi all I imagine this will have been discussed before but I can't find it. I am about to move into rented apartment it has a large south facing window. There is electric heating in the flat so I am glad of the window for the solar gains in winter but I am worried about it over heating in summer. I know on passive houses they put louvers to stop this. I was thinking of doing something similar on the balcony on the out side of the window. The other two windows face west so hopefully they should be okay. Any ideas?
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      CommentAuthornigel
    • CommentTimeMay 2nd 2016
     
    You are more likely to get overheating on the west facing windows as they angle of incidence is greater when the sun is lower in the sky in the evening.
  3.  
    I agree with Nigel. West will be the most problematic. You might want to model the house using SketchUp geolocated to where the house is. This will tell you exactly where the sun will be shining throughout the year. You may want a brise soleil either above, or to the side of the window, and either an overhang (that will shade in the summer but not in the winter) or of angled fins that will achieve the same.
    • CommentAuthorgyrogear
    • CommentTimeMay 2nd 2016 edited
     
    Or just wait until you've moved in, and if it has double glazing, check which surface has the low-E...
    Then if the overheating problem arises, either ask the Owner to turn the glass round, and/or buy a big planter and fill it with bamboos etc.

    gg

    edited for link to discussion about solar heat gain:
    http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=819&page=1#Item_0
    • CommentAuthortony
    • CommentTimeMay 2nd 2016
     
    Anything hanging up outside the windows will solve the problem.
    • CommentAuthorEd Davies
    • CommentTimeMay 3rd 2016
     
    Posted By: gyrogearcheck which surface has the low-E... ask the Owner to turn the glass round,
    Citation needed, as the say on Wikipedia. I'm very skeptical that the orientation of the low-e coating would make a lot of difference to the heat gain, or the heat loss for that matter (though maybe a bit more). And that's assuming it's a low-e coating of the sort intended to reduce heat gain anyway which seems less than probable if there's a close geographical connection with Hebden.
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      CommentAuthordjh
    • CommentTimeMay 3rd 2016
     
    • CommentAuthorEd Davies
    • CommentTimeMay 3rd 2016
     
    Yeah, like (nearly) everybody saying the LHC was stopped by a weasel. Enough repetition makes things true even if the original report (which I did read) was quite clear that it was a beech martin that did the fuse impersonation. It did give the species name in French though so I had to look it up on the French Wikipedia. Oh … :wink:
    • CommentAuthorCerisy
    • CommentTimeMay 5th 2016
     
    Thanks Ed - we now know what it was that was rummaging round in our loft when we first moved to France - well, until we found how it was getting in! We always assumed it was a Pine Marten - no, a Beech Marten. Excellent. We did, fleetingly, see the little blighter but not enough of it to positively identify it. What was the French name?

    Regards, Jonathan

    PS sorry to divert the thread.
    • CommentAuthorEd Davies
    • CommentTimeMay 5th 2016
     
  11.  
    We had a flat with south facing windows that overheated badly (lack of through ventilation was the real problem - ALL of the windows faced south).

    Adding window film from http://www.windowfilm.co.uk/residential/heat didn't eliminate the problem but made a very significant improvement.
    • CommentAuthortony
    • CommentTimeMay 5th 2016
     
    Can you get it back off in winter?

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