Situation = Trane Heat Pump 5 ton HVAC system [1 zone] was installed with the 2nd floor duct work reversed---intake ducts located just below ceiling is 'sort of' blowing cool air & lower ducts are acting as intake --- results obtained by holding tissue infront of vents.

Questions: Is there any possibility of damage to the system if this configuration has been in place for over 12 months? Would there be more load put on the system---more electicity used in a given period of time?

PS - Thanks to all who submit and responsd - I have learned so much over the past 4 years redaing this and the other thread - Terry thanks!!!!!