Reply to New Build Single Furnace/Dual Zone - Upstairs Zone Overheating in Winter (and not cooling enough in summer)

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Reply to "New Build Single Furnace/Dual Zone - Upstairs Zone Overheating in Winter (and not cooling enough in summer)"

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[quote=Anonymous]Fiddling with the thermostat isn't going to fix anything.

What you need to establish is whether the system is malfunctioning, or whether it's working as designed and the design sucks.

Each zone should have what's called a zone damper, it turns the air flow on or off to that zone. In the winter you want more flow to the bottom floor, and in the summer more flow to the top floor. That's what the zone dampers do. On each floor there should be a thermostat that controls the zone damper for that floor. What you need to check is that this is actually happening.

A simple check is to use the thermostats to turn on one zone at a time, and walk around and put your hand over the registers and see if air is coming out. When the upper floor is on and the lower floor is off there should be air coming out of the upper registers and no air from the lower registers, and vice versa.

If the zone dampers aren't working you need the guy who installed it to come back and get them working.

If they are working, and the system still doesn't keep your house comfortable, that's a longer conversation with the installer. [/quote]

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