Derek Cole explains why single HVAC systems create uneven temperatures: heat rises, so upstairs gets too hot while the downstairs thermostat keeps the lower floor cold. A zoning system divides your house into separate zones with independent thermostats, letting you control each floor's temperature separately.
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 way 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 they can work that way.
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