A short podcast segment (single speaker) explaining why upper floors are usually warmer than lower floors—heat rising, additional attic and window heat loads, and cooler crawlspaces downstairs—and offering practical HVAC advice: rather than installing two systems, zone a single system with separate upstairs and downstairs thermostats where ductwork allows. The speaker uses personal anecdotes to illustrate comfort trade-offs and limitations.
Chapters
The problem with one unit covering both is that you have different demands upstairs than you have downstairs. So when you look at a house and think about it, heat rises, obviously, right? So when he rises upstairs typically would be warmer than downstairs. Right. So chances are I've seen this before. The thermostat is downstairs. You have a unit that runs the whole house up and down. So to get upstairs comfortable, you didn't have to make downstairs freez. When I first got married, we lived in the apartment that was two stories but had one unit. So I mean, when you went downstairs at nighttime, it was like, you better put on like a big coat and everything because it can't happen. Because upstairs you have more of a load than you have downstairs. 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. 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 two units or what we've done quite a few times, which is zoning. You make downstairs one zone, you make upstairs one zone. It's very simple. If you have a unit that covers up and downstairs right now, you can very simply make it a two zone system. That way you have a thermostat downstairs, you have a thermostat upstairs, you can keep it that temperature you want, you keep it that temperature you want, and it can make it work that way. So the challenge with some houses is that there is not that duck chase in the house for the duck to be run to have one unit for the whole home. But if you already have that, obviously that's available. But using it, make it a zoning situation. I wouldn't get two units. I would just zone it upstairs, downstairs. And that will solve the problem. But until you do that, it is what it is. I mean, the thermostat downstairs, upstairs is warmer. In the summertime it's going to be. So you just have to freeze it out downstairs and get upstairs as comfortable as possible. Where the peace goes.
