Quote:
Originally Posted by Wookie
Yeah, what's all this E stuff? E1 E2 E3?
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In reference to what? The glass or the window? You may be talking about climate zones, to get your rebates the windows have to qualify for the zone you live in but that is usually zone A.B,C. Calgary is C (pretty sure).
http://www.allweatherwindows.com/are...uide/index.php Basic sliders are only a B. Make sure you get the right ones.
Here is a good link to glass R values.
http://www.allweatherwindows.com/are...lass_terms.php like was previously posted you can benefit from [passive solar but there is more than just the window involved. I am playing with this and you have to factor in where the sun passes the windows through the day, we are adding a deck with an awning and we have to calculate the best size to let the sun in early and block it in the hot parts of the day. It's pretty cool stuff but hard to accomplish.