Surface 4 low-e… condensation issues?
I’m just about to order windows for a project, and leaning towards spec’ing some of the units as double-pane with low-e on surfaces 2 and 4. My sales rep is trying to get current information on exactly which coatings are available, but it appears to be Cardinal 180 on surface 2 and i81 or similar on surface 4. He mentioned that there was uncertainty about the surface 4 coating because there had been some condensation issues when this product line came out. He was NOT clear on the details so I may have this all wrong, but is seems counter-intuitive to me–wouldn’t a better u-value mean warmer glass and less likelihood of condensation? I’d appreciate any comments on this type of glazing spec. Thanks.