Not sure if the info is accurate on effectiveness of double glazing in reducing heat loss in a large space with 75% glass windows and doors. Quote for job close to $15,000 (au).
We recently double-glazed our entire house. Our north side is mostly windows, floor-to-ceiling, for the passive heating (we live exposed at 1300m in the Snowy Mountains). The windows cost $30+ (we had some converted to double-glazed sliding doors). This winter the temperature outside might not often be getting above 5C and obviously drops big at night, but with our storage heaters the temperature inside is at least 20C. When we switch the fan off the heaters overnight, the temperature might drop to 17C at the far, coldest end (whereas last year the coldest inside we got to was 6C). Double-glazing isn't the only insulation need (good wall and roof is important), but for our needs it has made this a comfortable, cosy winter house. We'll have to wait and see what summer is like though.
Double glazing isn't cheap but neither are quality standard window systems. Beware of some systems as they may be double glazed but the frames are rubbish to the point where a single glazed Low E with quality frame will perform better and at a cheaper price! Don't choose a product by how much advertising they do as some of the well known manufacturer's are crap.
There are lots of small companies making great products with a few 'big boys' producing rubbish.......... Buyer Beware! Check out the AWS and WERS websites. It's quite complicated data to decipher and you may need assistance from a design professional.
User
jbantick
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