I am not sure what they meant by tripl—low-E, The difference between A solar heat gain of 0.42 vs somewhere around 0.22 for 366 would be quite noticeable IMO. Is this a bank if windows or just one window? If you use the rooms in away that you will be next to the glass it would be more noticeable.

I think you need to add solar shades to those windows regardless of the triple e issue.

LoE-180 is often specified in south-facing windows to maximize solar heat gain in the winter, when the sun is lower in the sky, but can be effectively shaded by awnings or trees in the summer. In Nebraska, this may be a good approach in winter. I would advise incorporating substantial roof overhangs or awnings into your design. Here is a useful calculator: Awning Calculator

High SHGC coatings really should only be used if part of an integrated passive-solar design, particularly making sure that walls and floors that will experience direct-sunlight are high mass, such as brick, stone over poured concrete, etc., allowing them to absorb heat during daylight, and radiate it during the night. Zoning of HVAC systems also must take this into account, as otherwise there will be significant temperature differentials between rooms with southern glazing and other rooms.

While in theory, LoE-180 plus i89 seem like a good combination for winter glazing in cold climates, it appears that the i89 coating may make the problem even worse - as it prevents heat inside the room from radiating out. According to the attached chart, this combination could cause an inside glass temperature of 105 degrees - 17 degrees higher than LoE180 alone. This does not change the SHGC - the i89 coating does not change this factor, but the glass itself will be warmer in summer, so someone standing or seated near it may be uncomfortable. Whether this leads to increased room temperatures, I don't know.

"Triple LoE" is meaningless. It could me the three coats on surface 2 that is LoE366. It could mean a triple-pane window with coatings on surfaces 2, 4 and 6.

Thank you. This new space will be our dining room, so it is a big concern of mine to make sure that it is comfortable. That chart is super helpful!

Here is the link that I normally go to: https://www.cardinalcorp.com/technology/reference/loe-performance-stats/