Exceed have a system for wooden windows that fits a double-glazed unit to the outside of the frame. Your existing single glass pane then becomes the third pane.
Don't know anything about pricing or how effective this system is. Also, not sure about the extra weight load on the window hinges.
Sorry to be contradictory but I don't see reason to think double glazing is of little thermal benefit over single glazing.
in terms of just looking at glass, yes. however you need to look at this in context of a house. changing from R 0.15 to R 0.26 is not huge. better yes. tripple glazing looking at around R 1.0. compared to a standard wall of R 2.0. of course it depends on if you get the cheapest or the best etc.
one of the ways to compare is to look at window size compared to wall size. a lot of kiwi homes have huge window aeras so even minor changes in glass spec will make a noticeable difference. but older homes with smaller windows a big change is required to get a noticeable difference. what can also compound this is houses with lots of windows have more supporting structure, so they may well have lower wall spec than homes with smaller windows. if you have a really poor low insulation standard walls with lots of windows, then any improvement is good. but in a decently designed and built home, not so much.
so long way of saying lots of nz homes are badly designed and built which is why any gain is noticeable, which you don't get in better designed homes.
in terms of just looking at glass, yes. however you need to look at this in context of a house. changing from R 0.15 to R 0.26 is not huge. better yes. tripple glazing looking at around R 1.0. compared to a standard wall of R 2.0. of course it depends on if you get the cheapest or the best etc.
uninsulated wall is R2 ? well very poorly insulated early 70s wall ...
in terms of just looking at glass, yes. however you need to look at this in context of a house. changing from R 0.15 to R 0.26 is not huge. better yes. tripple glazing looking at around R 1.0. compared to a standard wall of R 2.0. of course it depends on if you get the cheapest or the best etc.
uninsulated wall is R2 ? well very poorly insulated early 70s wall ...
a "standard" R2 wall is insulated. thats a generic wall made to common specs, R2.2 insulation if i recall correctly. which the bulk of nz houses have been built with since 1980's.
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