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Not being a smart ass but, If you have a door to your upstaris try keeping it shut and see if your upstaris zome works better. IF you keep the downstaris zone warmer than the upstairs one the stairway acts like a flue drawing warm air to the upstairs. Try shutting the door and see if it helps.
Call your heating person your Thermostat might not work with the zone valves or your thermostat might have to be adjusted there is a lever on the round brown Honeywell type if I remember right it is on tje lower right side of the thermostat by moving the lever toward the plus or mimus sign you can adjust how fast you furance reacts to your theromstat this might help you also. Good luck and have great Holiday season. THomT
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