Decoding HVAC Quotes
Replacing your heating and cooling system is a major capital expense. The price is driven by the "tonnage" (cooling capacity required for your square footage) and the efficiency rating (SEER2 for cooling, AFUE for heating).
Understanding SEER and AFUE
Contractors will present you with "Good, Better, Best" options. These tiers correlate directly to efficiency:
- Standard (14 SEER2 / 80% AFUE): The legal baseline. Cheapest upfront, but higher monthly utility bills. Uses single-stage technology (it's either 100% on or 100% off).
- High Efficiency (16+ SEER2 / 95% AFUE): The sweet spot for most homeowners. Costs 15% to 20% more upfront, but utilizes two-stage technology to run quieter and keep temperatures more consistent.
- Premium (18+ SEER2): Variable-speed compressor technology. Extremely quiet and perfectly maintains temperature, but costs thousands more. The ROI timeline often exceeds the lifespan of the equipment.
Heat Pumps vs. Traditional AC
A heat pump is simply an air conditioner that can run in reverse to provide heat in the winter. They are highly efficient and run entirely on electricity. If you live in a moderate climate, a heat pump can completely replace both your AC and your gas furnace. In very cold northern climates, a "dual-fuel" system (heat pump paired with a gas furnace backup) is becoming the standard.
The Importance of Installation
A premium 20-SEER unit installed poorly will perform worse than a cheap 14-SEER unit installed perfectly. HVAC is a closed, pressurized refrigerant system. If the contractor doesn't pull a proper vacuum, braze the copper lines correctly, and calibrate the airflow, the system will fail prematurely. Do not choose a contractor based solely on the lowest bid.