Derek Cole explains why upstairs rooms get hotter: heat rises from below, the attic adds heat load above, and cold air settles downstairs. Fix it with two separate HVAC units or zoning systems that let you control each level independently.
Downstairs, heat rises. You also have the attic upstairs. So you have these forces you're going against. You have the attic, you have windows, you have upstairs heat rises, and downstairs, of course, cold air falls. And you don't have an attic downstairs, so you don't— and the crawl space is not that much of a heat load compared to an attic. So it's different demand. So how you solve that problem is— Either 2 units or what we've done quite a few times, which is zoning. You make downstairs one zone, you make upstairs one zone.
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