Not necessarily. If they were two separate rooms they would have had two separate vents regardless of square footage or one room would have no heat/ac. The two small bedrooms in my house have 1 vent each, but my bonus room is bigger than the 2 of them combined and does fine with just 1.
T1Demon t1_j0t565g wrote
Reply to comment by shoeish in Closing off an AC vent by flyingGoatPenis
Not necessarily. If they were two separate rooms they would have had two separate vents regardless of square footage or one room would have no heat/ac. The two small bedrooms in my house have 1 vent each, but my bonus room is bigger than the 2 of them combined and does fine with just 1.