Start with what failed
Capacitors, contactors, fan motors and thermostats are routine repairs on an otherwise healthy system. A failed compressor, a leaking indoor coil or a cracked heat exchanger is a different conversation, because those repairs approach the cost of new equipment and, for refrigerant-side parts, can trigger permit and HERS requirements of their own.
Refrigerant is the hidden factor
Most systems installed before 2025 run on R-410A, which is being phased down. They can still be serviced, but repeated leak repairs on an aging R-410A system get harder to justify as refrigerant costs rise. New systems use A2L refrigerants such as R-454B or R-32 and need a matched indoor coil, so replacing just the outdoor unit isn't a like-for-like option.
Climate zone changes the math
In coastal Climate Zone 7, an older system runs fewer hours, so an efficiency upgrade pays back slowly; a sound repair often makes sense. In inland Climate Zone 10, a system that runs hard all summer earns back efficiency gains faster, and comfort problems often trace to ducts as much as equipment.
Questions that settle it
Get answers to these before deciding.
- Which refrigerant does the system use, and is it leaking?
- How old are the outdoor unit and indoor coil, and do they match?
- What would a replacement need: permit, HERS testing, duct work?
- Is the repair price itemized and in writing?
Keep reading
Looking for city-specific rules? See our SoCal city guides.
Sources
Last checked October 2026.