Low-E-2 , low-E-3 , and no-E glass for heating climate
I’m replacing a 60*37 double pane picture window that’s failed for the second time. The Marvin salesperson is telling me my choices are Low-e 2 or “for compliance with recent Title 24 requirements” Low-e 3. Marvin wants $980 for the 2 or a bit more for the 3.
Now I thought 2 and 3 referred to which glass surface the low-E coating was applied to, which has to do with climate. (See also https://www.greenbuildingadvisor.com/blogs/dept/musings/all-about-glazing-options ). And thus I’m confused by terminology. I see elsewhere 2 and 3 refer to how many layers of metal, but 3 makes no sense as one of those layers must be on the exposed glass surface.
So, the question is, what terms should I use to order the best glass for this condition:
- A house with no air conditioning, and no need for it due (Berkeley CA)
- Northwest facing window getting almost no direct sun except near sunset.
- Picture window, where coatings other than perhaps anti-glare, are undesirable.
I’d rather have a nice clear picture window, than minimal energy savings. I’d rather have something durable, over the need to landfill the window for a fourth time.
Is there a online shop that will sell a high SHGC Low-E picture glass panel I can adapt to this window, bypassing Marvin?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part