Had my furnace and ac unit replaced this spring but it seems to take forever to cool the house and has long run times even when the outside temp is below the house temp. The furnace is a Bryant OVM oil furnace (OVMAAB036098AABF) with a Bryant 2.5 ton N coil (CNPVP3017ATAACAA). My return duct is 19x10 with a 16x24 return grill. Ive since read that coils should be 6 inches above the furnace because of the drain pan on A coils and the instruction manual says A clearance of 15cm (6) is required between the bottom of the coil drain pan and the top of the heat exchanger.
If the cased coils are sitting on the furnace does this clearance exist? I cant see the bottom of the pan or the exchanger, but then why mention it in the Installation instructions.
Does the same problem apply to N coils or are their drain pans shaped differently?
My house is always dry about 43% RH and I do live in a humid region. I live in a 1000sq ft ranch with full basement where the furnace is located. Im also concerned with the heating system coming that I will not have enough air flow for the new furnace. Last night with thermostat set at 74 and outside temp of 69 ran for half an hour during one of its cycles. Minimal heat load on house TV, laptop and a few florescent lights.