Know your current system
Age, repair frequency, and uneven temperatures signal it may be time to replace. Systems over 15 years are candidates.
- Note fuel type: gas, electric, oil, or heat pump
- Rising energy bills with no rate change
- Strange noises or short cycling
Efficiency ratings
SEER2 measures cooling efficiency; AFUE applies to furnaces. Higher ratings cost more upfront but save over time.
- Heat pumps heat and cool — strong in moderate climates
- Variable-speed blowers improve comfort and humidity control
- Proper sizing avoids oversizing that short-cycles
Ductwork and indoor air quality
Leaky ducts waste 20–30% of conditioned air. Sealing and insulation improve performance.
- Change filters every 1–3 months
- Consider whole-home humidifiers or UV air cleaners
- Zoning can help multi-story homes
Maintenance and rebates
Annual tune-ups extend equipment life. Federal and utility rebates may apply to high-efficiency heat pumps.
- Keep service records for warranty claims
- Smart thermostats integrate with many new systems
- Compare total installed cost, not equipment alone
Choosing an HVAC contractor
Load calculations (Manual J) should drive sizing — not rule-of-thumb replacements.
- Licensed refrigerant handling for AC work — ask to see the card
- Written warranty that splits labor years from equipment years
- A Manual J load calc on the bid, not a same-size swap as the default
Comfort is ductwork and sizing, not the outdoor-unit color
A high-SEER condenser on leaky attic ducts still feels like the old house. Ask for a load calc and a duct test or at least a visual of returns. Filters, a clean coil, and a thermostat that is not fighting a lamp all change how the system you already own behaves.
- Short cycling often means oversized equipment or a bad thermostat location
- A heat pump is a system, including backup heat in cold climates
- Use the replacement-cost guide for dollars; this page is how the system should run