GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter X Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Low-E Coating on Large-Format South-Facing Window

user-7568882 | Posted in Energy Efficiency and Durability on

Curious what the GBA hive mind thinks about this particular arrangement:

I am installing a custom picture window (large 6’x5′) on a south facing facade in central VT. The building is insulated but only R20, the building is single story 450 sq. ft., and the only source of heat is our wood-stove and possible passive solar. We have overhangs on this south facade which create some shade in the summer months but not much.

The Glass will be double pane ( would love to do triple but cannot justify the cost) and the question is: should I get Low E coating, and on what surface that coating should be on should I get it?

Thanks….

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. [email protected] | | #1

    Yes you should always get a LowE coating.
    If you want maximum solar gain then go with a single silver sputter coating on surface 3 of the IG unit, or opt for a hard coat.
    If you want moderate solar gain then go with a dual silver coating on surface 2.
    The more layers of silver the better the U factor of the unit, but the lower the SHGC

  2. Expert Member
    Akos | | #2

    For my own windows, I went down the rabbit hole of energy modeling and picking coatings based on that. Technically this is 2% more efficient but fails to take into considerations comfort. When it gets cold out on clear nights, I can feel the cold air cascading off the windows, I regret not going to triple pane with soft coat low E.

    Get quality windows, get the lowest U value your budget allows, don't worry about SHGC.

    P.S. Around me, for a single fixed window, the cost of triple pane is not all that much more, it is well worth it just for improved comfort.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |