we installed a 5-ton ac with a 95% gas furnace system on a 2 story open concept home, system is in the attic and registers are on the ceiling. install 2 zone dampers and balance damper. return grill is located at the 2-floor ceiling in the middle of the open. and the 2 thermostats ( 1 floor and 2 floor ) are close to this open too. The problem is 1 floor is 65f and 2 floor is getting up to 80f. I am in NY. on normal days we can get the 2 floor to be 72 and the first floor 67f. but on a really cold day is no working properly. any idea how to fix this problem. ( we adjust the 1 floor thermostat to be +3f offset already) problem is still happening.
source https://hvac-talk.com/vbb/showthread.php?2226672-Problems-Heating-a-2-story-open-concept-home&goto=newpost
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