If a passive house is designed well is it worth the extra cost for Low E window coatings?

Joe Van Kuren
Updated: Aug. 3, 2020

Assuming the windows are appropriately facing south and the entire design is sound with thermal mass and good overhangs would double or triple glaze Argon filled windows be appropriate without the Low E coating?  The Low E coating does reduce the solar gain even if you choose a coating designed for the northern climate.  (I am in Ontario 44 degrees north).  My application would have 5x5 ft fixed windows with 5x2 foot awning style windows below and above for ventilation.

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