First, regardless of how many thermostats you have only 1 operates the 1 & only furnace that only blows from floor vents, others might control heat pump/heat strips on the air conditioner if equipped, but will blow from ceiling vents only.
Second remove the screws to the vents that aren't blowing to see if the duct is attached. Mine the duct to the bedroom had come loose underneath, then it was too hot so added a vent with louvers to close it off nearly all the way.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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