How Much Does It Cost to Replace an AC Unit in the Bay Area?

If you just want the number: most of our 2025 and 2026 AC replacements were heat pumps, one system that heats and cools, and on those invoices the typical bill ran $11,400 to $14,400, with a median of about $12,100. Straight condenser swaps were too rare in that time to give you a range of our own.

Worth knowing up front: those are Bay Area prices from our own invoices, not a national average from a generic online cost guide. Here’s the breakdown, what those prices covered, and what should be on a quote before you sign one.

What Our Customers Paid

Here’s the spread on 11 heat pump jobs in 10 single-family homes, 2025 and 2026. The cheapest came in at $9,700. Most of them sat between $11,400 and $14,400, and the median was about $12,100. Larger systems went up to $17,700. We left out one job that replaced several systems in one go; it cost more.

Those invoices covered the equipment and its installation, a 10-year manufacturer warranty on that equipment, and our labor warranty. Labor runs 2 years, or 10 years while you keep an active maintenance plan, which is $290 per visit, two visits a year. Goodman, Bryant and Cooper&Hunter were among the brands. If your house needs more than that, it goes on the written estimate, and your written estimate lists everything that’s included.

That’s history, not a quote. Two houses with the same square footage can land a few thousand dollars apart once a tech actually looks at the ductwork, the electrical panel, and where the outdoor unit has to go. Your price comes from a written estimate after the free in-home assessment.

Square footage is a rough proxy for tonnage. Insulation, window area, ceiling height, and orientation all shift the real number, sometimes by half a ton in either direction, which is why a same-size swap based on the old unit’s tonnage isn’t the same thing as a real load calculation. Our free HVAC load calculator gives you a ballpark load estimate in a few minutes; final equipment sizing still needs a site-specific Manual J with measured building details.

Cost by System Type

The path you’re replacing into matters more than the square footage of the house.

• Central AC only (new condenser and matched coil): we did too few of these in 2025 and 2026 to publish a range. The written estimate after the visit prices it, with the condenser and coil sized to your home rather than to whatever tonnage happened to be out there before.
• Ductless mini-split: a Mitsubishi Electric ductless system usually runs about $5,500 to $9,000 for each room or zone, depending on the home. No ductwork required, which is why this is usually the answer for a room addition, an ADU, or a house that never had ducts. Our free mini-split calculator sizes it per room and gets you a ballpark before you call anyone.
• Whole-home heat pump: most of our 2025 and 2026 homes paid $11,400 to $14,400, as above. It takes over your heating too, not just your cooling.

Whether a heat pump conversion beats a straight AC swap for your house is a bigger decision than this article can cover on its own. We wrote up the full numbers in what heat pumps actually cost in the Bay Area.

What a Legitimate Quote Should Include

A single number with no line items behind it is the first thing to question. A real replacement quote should show:

• A load calculation. Sized to your house, not a same-tonnage swap because that’s what was already there.
• Matched equipment. A condenser and coil sized and rated to run together. Pairing new outdoor equipment with an old coil isn’t something we’d recommend, mismatched systems run less efficiently and can affect what the manufacturer covers under warranty.
• The permit. Required for HVAC replacement work in California cities. If a bid is noticeably lower and doesn’t mention one, ask why.
• Brand, model, and efficiency rating. You should be able to look up the SEER2 rating and compare bids apples to apples.
• What happens to the old equipment. Removal and disposal should be spelled out, not assumed.

Get this in writing from more than one contractor. It’s the only way to compare bids on what they actually include, not just the number at the bottom.

What Actually Moves the Number

A few things swing the price more than the size of the house does: equipment efficiency (a higher SEER2 rating costs more upfront and saves more over the life of the system), ductwork condition (sealing or replacing leaky ducts adds cost but keeps a new system from underperforming), and access (a condenser in an open side yard is a different job than one on a roof or wedged behind a fence). We go through all of it, including the repair-versus-replace math, in AC Replacement Cost: What Moves the Number Up or Down. This piece is the short version with the numbers up front.

The Free Estimate vs. the $99 Diagnostic

These are two different visits, worth knowing apart. If you’re replacing a system, the in-home assessment is free. We run the load calculation and check the ductwork and electrical panel. You get a written report of what we found the same day, then a written estimate with the exact price. If your AC is broken and you’re not sure yet whether it needs a repair or a full replacement, that starts as a $99 diagnostic, credited toward the work if you go ahead. Either way, you get a straight answer before anything’s decided.

Is Repair Still the Better Call?

Replacement isn’t automatically the right answer just because you’re reading an article about replacement cost. If the system is under 10 years old and what failed is a capacitor, a contactor, or a fan motor, repairing it is usually the cheaper and smarter move. The rough rule the industry uses: multiply the repair cost by the unit’s age in years, if that tops $5,000, replacement starts to win. We break down the full logic in Repair or Replace Your AC.

Rebates Can Offset a Heat Pump Upgrade

If you’re replacing an aging AC with a heat pump rather than another straight AC, local and manufacturer programs may bring the cost down depending on your address, household, equipment and what’s currently funded. BayREN’s former Home+ rebates ended in 2024, and Ava’s current homeowner page directs customers to an address-level Incentive Finder. These open and close throughout the year, so we confirm what’s actually live for your address at the estimate rather than quote a number that might already be gone. The current list is in our California HVAC rebates guide.

Get a Straight Answer Before You Sign Anything

If you’ve got a quote in hand that’s a single number with nothing itemized underneath it, that’s worth a second opinion. We handle HVAC installation across Danville, San Ramon, Alamo, and the rest of the Tri-Valley and East Bay. Call (925) 999-4095 for a free in-home estimate on a replacement, and if a repair actually makes more sense for your system, we’ll tell you that instead. CSLB #1136642.

Key takeaways

• A typical heat pump replacement on our books ran $11,400 to $14,400, median about $12,100: heat pumps in 10 single-family Bay Area homes, 2025 and 2026.
• Straight condenser swaps were too few for a range of their own. A Mitsubishi Electric ductless system usually runs about $5,500 to $9,000 for each room or zone, depending on the home.
• Home size is a rough guide. Ductwork condition, equipment efficiency, and access to the equipment move the number more than square footage alone.
• A legitimate quote itemizes the load calculation, matched equipment, the permit, and the efficiency rating, not just one flat number at the bottom.
• The in-home estimate for a replacement is free. Repairs start with a $99 diagnostic, credited toward the work if you move forward.

Related questions

Need help with your system? Call (925) 999-4095 or book a visit. Repair diagnostics are $99, credited toward the repair. Installation assessments are free.

Written by Andrew Kuznetsov. Andrew is the founder and owner of Bay Area HVAC Service (ADRIUM Service Solutions). He holds a California Contractor License (CSLB #1136642), EPA Section 608 Universal certification, and is factory-trained on Daikin (Houston, 2025) and Mitsubishi. He writes from direct field experience, not marketing copy.

Further reading

• Carrier Furnace Status Codes and Greenspeed Heat Pump Fault Codes , A Carrier furnace blinks a two-digit status code on an amber LED. A Greenspeed heat pump or AC sends a code like 18-11 to the Infinity thermostat. Here are both lists from Carrier's service manuals, by model, with the checks you can do before you call.
• Choosing a controller for your Mitsubishi system , Handheld remote, MHK2, wired control or the Comfort app: what to check before adding a controller to a Mitsubishi indoor unit.
• Mitsubishi heat pump lineup: which family fits your home? , Compare FX, GX, JX, HX and WX wall units, SUZ indoor styles and P-Series, then decide between a single-zone system and a multi-zone layout.