AC Installation
First-time central air for older Pasadena homes, sized by a room-by-room load calculation and fitted to your attic and floor plan.
Learn moreCooling in Pasadena, CA
AC replacement in Pasadena that fixes the ducts, not just the box
Swap a worn-out air conditioner for a correctly sized SEER2 system, with duct testing and permit work handled in one job.
- Answering 24/7
- Price quoted before work
- Pasadena and nearby cities
Quick answer
Replacing an AC in Pasadena usually means a new condenser and a matched indoor coil, sized from a fresh load calculation rather than copied from the old label. California's Title 24 rules can require duct leakage testing when you replace the system, so Marco's tests the ducts, seals or replaces what fails, pulls the permit, and installs equipment using the newer A2L refrigerants.
AC Replacement
What ac replacement covers at your home
Most air conditioners in our area last somewhere between 12 and 20 years, depending on how hard the summers were and how often the coils got cleaned. Once a system reaches that age, repairs come closer together, and a failed compressor or a large leak can push the repair bill near the cost of new equipment. That is usually when people start asking about replacement.
A replacement is a chance to correct problems the old system had all along. Many Pasadena homes have an AC that was oversized when it went in, ducts that leak into the attic, and a return that is too small. Marco's looks at all of it, so the new system runs better than the old one ever did, not just newer.
Warning signs
Signs it is time for AC replacement
System older than 15 years
Coils corrode, compressor valves wear and insulation on wiring gets brittle with age. Past this point, each repair buys less time and the next failure is usually not far behind.
Still running on R-22
R-22 is no longer made. Any leak repair on these units means buying reclaimed refrigerant at a steep price, and most of the system is likely near the end of its life anyway.
Big repair quoted recently
When a compressor, coil or condenser repair is quoted at a third or more of a new system's price on an aging unit, replacement usually makes more financial sense.
Electric bills keep climbing
An old 10 SEER unit uses noticeably more power than a modern SEER2 system for the same cooling. Rising summer bills without a change in habits often point to declining efficiency.
Rooms never feel even
If one side of the house is always warmer, replacement is the moment to fix duct sizing, add a return or consider zoning instead of repeating the same layout.
Repeated refrigerant top-offs
Needing refrigerant every summer means there is a leak that was never fixed. On older coils with pinhole corrosion, the leak often keeps moving from spot to spot.
Matching the new condenser to the indoor coil
A split system works as a pair. The outdoor condenser and the indoor evaporator coil are rated together, and the SEER2 number on paper only holds when the two are a matched set. Putting a new condenser on a 15 year old coil is a common shortcut that leaves efficiency on the table and often causes early failures, because the old coil may be sized for a different refrigerant and metering device.
New equipment made for 2025 and later uses A2L refrigerants such as R-454B or R-32. These cannot be mixed with R-410A and need components designed for them. In most replacements we install a new coil, a new line set or a thoroughly flushed existing one, a new filter drier, and the leak detection sensors some A2L air handlers require.
Title 24 duct testing on a replacement
California's energy code, Title 24, can require a duct leakage test when you replace an air conditioner or furnace in an existing home. The test pressurizes the duct system and measures how much air escapes. If leakage is above the allowed limit, the ducts must be sealed or replaced before the permit can close, and a third-party rater often verifies the result.
Homeowners are sometimes surprised by this, but it is good news in practice. Leaky attic ducts in Pasadena pull in 130 degree air and dust, and fixing them often does more for comfort than the new condenser does. We test early, include any sealing in the quote, and coordinate the verification so the permit finishes cleanly.
- Duct leakage test measured with a calibrated fan and pressure gauge
- Sealing with mastic at boots, plenums and joints where the ducts are sound
- Replacing crushed, torn or uninsulated flex duct when sealing is not enough
- Verification by a third-party rater when the permit requires it
Getting the size right the second time around
We do not copy the tonnage from the old unit. Since that system went in, you may have added attic insulation, replaced windows, enclosed a porch or converted a garage. A new load calculation often shows the house needs less capacity than the old label, which means lower equipment cost and steadier comfort. Sometimes an addition means it needs more. Either way, the number comes from your house, not a guess.
Step by step
How an AC replacement job runs
- 1
Assess the old system
We record the existing equipment, check the coil, line set, drain, electrical disconnect and panel, and look at duct condition and return size in the attic.
- 2
Load calculation and options
A room-by-room load calculation sets the size. You get two or three equipment options, from single-stage to variable-speed, with prices side by side.
- 3
Permit and duct test
Once you pick a system, we pull the permit where required and test the ducts so any sealing or replacement is scheduled in the same job.
- 4
Remove and install
Old refrigerant is recovered, the old units come out, and the new condenser, coil, line set, drain and disconnect go in. Most replacements finish in one day.
- 5
Commission and close permit
We charge by subcooling, measure airflow, register the equipment warranty with the manufacturer, and arrange the final inspection and any third-party verification.
Typical prices
What AC replacement costs in Pasadena
Replacing an existing central AC is simpler than a first-time install because ducts and power are already in place. These typical 2026 ranges cover Pasadena and nearby cities. Duct testing results and access can change the scope, so the final price comes after the technician inspects the system, and we quote before starting.
| Job | Typical range | What is included |
|---|---|---|
| Condenser and matched coil, single-stage | $7,385 to $10,940 | Standard efficiency SEER2 system with new line set and drain work |
| Condenser and coil, two-stage or variable-speed | $10,615 to $16,780 | Quieter operation, better humidity control, higher SEER2 ratings |
| Duct sealing to pass Title 24 testing | $742 to $2,315 | Mastic sealing at joints and boots where duct runs are still sound |
| Partial or full duct replacement | $3,860 to $9,475 | When existing ducts are crushed, torn or too small for the new system |
Price moves with tonnage, efficiency level, attic access, duct test results and whether the furnace is replaced at the same time. Ask about current PWP, SCE or SoCalGas rebates and state heat pump incentives when funding is open. Compare other jobs in our Pasadena HVAC price guide.
AC replacement in Pasadena homes with aging equipment
Many Pasadena air conditioners went in during the late 1990s and 2000s, added to homes built decades earlier. Those systems are now reaching the end of their service life at about the same time. In neighborhoods like Madison Heights and San Rafael, we often find a condenser that was upsized to make up for undersized ducts, which never really worked. Replacement lets us correct the ducts and drop to the right size.
Homes in Altadena and the foothill edges of Pasadena that were affected by the Eaton Fire may have equipment that ran through heavy smoke and ash. Even if the AC still runs, ash can coat the condenser and get pulled into ducts. When we replace systems in those homes, we inspect and clean or replace ducts as needed, and we take the time to explain each step with care.
Related work
Often booked with AC Replacement
Full HVAC System Replacement
Furnace, coil and condenser or a heat pump replaced together as a matched system, with duct testing and the city permit handled.
Learn moreDuct Sealing & Leak Testing
We measure duct leakage with a calibrated fan, seal joints with mastic, and test again so you see the actual improvement.
Learn moreFurnace Replacement
An old furnace swapped for a right-sized new one in the same attic, closet or garage, with venting, ducts and permit handled.
Learn moreWhere we do AC Replacement
Our technicians handle this work all over Pasadena and the surrounding San Gabriel Valley. A few of the places we cover:
Questions
AC Replacement questions from Pasadena homeowners
Usually not with new equipment. Current condensers use A2L refrigerants such as R-454B, and they need a matched indoor coil rated for that refrigerant. Pairing a new condenser with an old R-410A or R-22 coil causes efficiency loss and early failures, and manufacturers may limit warranty coverage. In most cases, both pieces get replaced together.
California's Title 24 energy code can require duct testing when an air conditioner or furnace is replaced in an existing home. The goal is to make sure the new system is not losing cooled air into the attic. If the ducts leak beyond the limit, they get sealed or replaced before the permit closes.
If the furnace is over 15 years old, doing both at once often saves on labor and permit costs, and the new blower is matched to the new coil. If the furnace is newer and in good shape, we can replace just the AC side. We also price a heat pump as an option that replaces both.
Once you choose equipment, most straight replacements are installed in one day, sometimes two if duct sealing or replacement is part of the job. Scheduling depends on equipment stock and the season. In peak heat, we give you a realistic install date when you approve the quote.
Our technicians recover the refrigerant from the old system into a recovery cylinder before disconnecting anything. Venting refrigerant into the air is against federal rules. The old condenser and coil are hauled away for metal recycling, and the recovered refrigerant goes back for reclaiming or proper disposal.
Need heat or cooling back today?
Call our Pasadena line any hour. A person answers, asks a few questions about the system, and gives you an arrival window.
(626) 879-0711Answering 24 hours, 7 days