When replacement makes sense
- The system needs a major repair, such as a compressor or coil.
- It uses R-22 refrigerant and has a leak.
- It no longer keeps the house comfortable on hot afternoons.
- Repairs are becoming frequent.
What to compare in quotes
Load calculation
Ask how the size was chosen. An oversized unit short-cycles; an undersized one runs all day.
Efficiency rating
SEER2 for cooling, and HSPF2 for heat pumps. Higher ratings cost more up front and less to run.
Ductwork
Leaky or undersized attic ducts can undo a new system's efficiency. Ask whether ducts will be tested or sealed.
Permit and warranty
Who pulls the permit, who schedules the inspection, and what labor and parts warranties apply.
Permits in California
The California Energy Commission building energy standards (Title 24) cover most HVAC change-outs. That can include duct testing and verification by a HERS rater. A permitted job also gives you an inspection record when you sell the home.
Consider a heat pump
If you're replacing both the AC and the furnace, a heat pump can handle both. Utility rebates from SMUD or PG&E often focus on heat pumps.
FAQ
Do I need a permit to replace my AC in California?
In most cases, yes. California's Title 24 energy standards apply to HVAC change-outs, and many jobs need duct leakage testing verified by a HERS rater. Your contractor should pull the permit through your city or county.
What size AC do I need?
Size should come from a load calculation (often called Manual J) that considers your home's size, insulation, windows and orientation, not only the size of the old unit.
Are there rebates in Sacramento?
SMUD and PG&E offer rebates and programs that change over time, especially for heat pumps. Check your utility's website and ask your contractor which ones apply.