What AC replacement costs in the San Gabriel Valley in 2026, and what moves the price

When an old AC quits in July, the first question is almost always the same: what is a replacement going to cost? It is a fair question, and a frustrating one to get vague answers to. The honest answer is a range, because two homes on the same street in Pasadena or Arcadia can need very different work. One has sound ducts and a modern panel. The other has crushed attic ducts, a 1950s panel and a condenser wedged into a narrow side yard.

Below are typical 2026 ranges we see for Southern California homes, followed by the factors that push a job toward the low or high end. These are typical ranges, not quotes. The final price comes after a technician sees the system and the house. We have also included the add-ons that most often surprise homeowners, such as duct work, electrical updates and permit testing, so you can see where a number comes from and compare quotes on an even footing.

These ranges cover equipment, standard installation labor, removal of old equipment and typical materials for a single family home of average size in the San Gabriel Valley. They do not include major duct replacement, electrical service upgrades or unusual access work, which are listed separately below. Higher efficiency and variable speed equipment sits toward the top of each range. They also assume the equipment goes back in roughly the same location, with the same line set path and condensate drain, which keeps labor predictable.

Size matters too. Most homes in the area use systems between about two and five tons of cooling. A small bungalow and a large two-story foothill home sit at opposite ends of these ranges even with the same brand and efficiency level. Two-story homes sometimes need two systems or a zoning setup, which moves the total well above a single system. A proper load calculation sets the size, rather than copying whatever was installed decades ago.

• Outdoor AC condenser and matching indoor coil only: about $7,840 to $13,940
• Complete AC and gas furnace system: about $12,420 to $21,760
• Complete ducted heat pump system replacing AC and furnace: about $13,720 to $24,580
• Single zone ductless heat pump mini-split: about $4,870 to $8,460
• Multi zone ductless system with three or four heads: about $11,380 to $19,670

Old ductwork is the most common reason a quote climbs. Many Pasadena and San Gabriel Valley homes have attic or crawlspace ducts that are decades old, with loose joints, crushed flex runs, torn insulation or undersized returns. A new system attached to leaky ducts will not deliver the comfort or efficiency you paid for. When a system is replaced, California energy rules can require a duct leakage test, and ducts that fail need sealing or replacement.

Duct sealing on otherwise sound ducts is a smaller add-on. Full duct replacement is a bigger project and depends on the number of runs, attic access and the home's size. Older homes that once had a floor furnace or wall furnace and later got ducts added often have return paths that are too small for modern equipment, and correcting that is one of the most useful upgrades for comfort and for the life of the new blower and compressor.

• Duct sealing and repair of accessible runs: about $1,140 to $2,870
• Full attic duct replacement for an average home: about $4,380 to $9,780
• Adding or enlarging a return to fix airflow: about $680 to $1,840

Where the equipment sits matters. A furnace in a garage with good clearance is quicker to replace than an air handler in a low attic that has to be reached through a small hatch. Condensers on rooftops or in tight side yards on hillside lots in La Canada Flintridge or Sierra Madre take more labor and sometimes extra equipment to move into place. Long line set runs, a new concrete pad or a condensate pump also add cost.

Equipment choice is the other big lever. Single stage systems cost less up front. Two stage and variable speed systems cost more but run quieter, handle long hot afternoons more steadily and use less energy. Smart thermostats, zoning and added air filtration are optional and can be added later. Timing matters a little too: replacing a system in spring or fall, before it fails, gives you time to compare options instead of deciding in the middle of a heat wave.