Have a new 2044 sq ft heated brick home w/ tyvek wrap house that has 207 sq ft double pane low e windowws, 84 sq ft outside door space, 14' vaulted ceiling in 21' x 18 ft rm, 12 ' vaulted ceiling in 10' x 11' rm rest of ceiling 8' h . A 3 1/2 Rheemn RRNA-B042JK10E ton gas pack was installed heat 100,000 BTU and Cooling 42,000 btu. My problem is that the heat runs for about 5 min then off about 17 min. seems its always cold in the living room where the vaulted ceiling is.
Themostat was placed in the hall over the return duct where all the bedrooms are located. Should this be moved to the living room. I was told by the HVAC installer he could cap off something on the heat exchanger for less btu,s so it would run longer does this seem logical, or is unit just to big for house?