Short advice from a homeowner/HVAC speaker about problems when a single HVAC unit serves both upstairs and downstairs: upstairs tends to be warmer because heat rises, so a single thermostat (often downstairs) forces trade-offs—making downstairs too cold to satisfy upstairs. Recommended solutions are installing two separate units or creating zoning with separate upstairs/downstairs thermostats to control temperatures independently.
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 upstairs typically would be warmer than downstairs. So chances are the thermostat is downstairs. You have a unit that runs the whole house up and down. So to get upstairs comfortable, you then have to make downstairs freezing. 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 that 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 work that way.
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