We are replacing the HVAC unit in our townhouse in Washington DC and are getting quotes on a dual fuel system from 3 contractors. All 3 levels of the building total 1200 sq ft. Depending on who you ask , calculated Heat loss is any where from 17,500 to 21,000 and Heat Gain is from 9,200 to 12,500.
Contractor 1: 1.5 ton 15 SEER
Carrier Furnace and Heat pump
Contractor 2: 3 ton 15 SEER
York (Luxaire Acclimate 9V series) Furnace and Heat pump
Contractor 3: awaiting his quote.
My questions are:
Why such a discrepancy between tons for quotes 1 & 2?
Is tonage a random concept and assigned by the manufacturer or does it refer to an absolute measurement? In other words could one of these quotes be configured incorrectly?