HVAC Replacement Cost Guide for San Antonio, TX (2026)
A full HVAC replacement in San Antonio typically runs $4,500 to $13,500 depending on system type, home size, and ductwork condition. With a cooling season that stretches from May through October and older housing stock in neighborhoods like Alamo Heights and Terrell Hills often carrying undersized ductwork, a straightforward equipment swap can quickly turn into a bigger project. This guide breaks down 2026 pricing by system type and what to check before you commit. For hiring and vetting steps, see our San Antonio HVAC hub.
By Jason Green · HVAC · Published September 7, 2026 · Updated September 7, 2026 · 8 min read
What drives HVAC replacement cost in San Antonio
Equipment type is the biggest cost driver: a straightforward split-system AC and condenser replacement runs roughly $4,500 to $8,000, while a full SEER2-compliant split system replacement that includes ductwork work can reach $6,200 to $11,500. Heat pump installs, which are gaining interest in San Antonio for their year-round efficiency given the region's mild winters, typically run $7,000 to $13,500.
Home age matters as much as equipment choice. Older homes in King William, Monte Vista, and parts of Alamo Heights often have ductwork that was added after original construction and is undersized for modern high-efficiency systems, which can add $1,800 to $6,500 in duct repair or replacement to a project that otherwise looked like a simple equipment swap.
Refrigerant transition: what R-454B means for your quote
The HVAC industry is shifting away from R-410A refrigerant toward lower-GWP alternatives such as R-454B for new equipment sold in 2026. This affects available equipment options, and contractors should tell you upfront which refrigerant a proposed system uses, since it can influence long-term service costs and parts availability.
If you are repairing rather than replacing an older R-410A system, ask your contractor about remaining refrigerant supply and cost, since recharges on older refrigerant types can become more expensive as the industry phases them out. Our HVAC repair cost guide for San Antonio covers repair pricing by failure type in more depth.
Permits, rebates, and paperwork to plan for
Any full system replacement inside San Antonio city limits requires a mechanical permit from the City of San Antonio Development Services Department, filed through the BuildSA portal by a contractor registered with the city. Confirm in writing who is pulling the permit before work begins.
CPS Energy offers rebates on qualifying central AC and heat pump replacements, generally $90 to $310 per ton depending on efficiency tier, but the rebate application requires an itemized invoice, AHRI certificate, and permit information for San Antonio projects, so keep documentation organized from day one of the job.
Comparing bids for a replacement
Get two or three written estimates for any full replacement, and make sure each one includes equipment brand and model, SEER2 rating, refrigerant type, a load calculation for your home, ductwork scope, and warranty terms. A bid that skips a load calculation is a warning sign that the contractor may be oversizing or undersizing your new system.
Once you have bids in hand, you can compare San Antonio HVAC pros to get matched with vetted local contractors and avoid the guesswork of picking blind from search results.
Typical cost ranges
| Full AC/condenser replacement | $4,500 - $8,000 |
| Full split system replacement (SEER2 compliant) | $6,200 - $11,500 |
| Heat pump conversion or install | $7,000 - $13,500 |
| Ductwork repair or replacement | $1,800 - $6,500 |
| Gas furnace replacement | $3,800 - $7,500 |
| Annual maintenance/tune-up plan | $130 - $325 |
Ranges are general estimates gathered from homeowner-reported quotes, not an offer or a quote for your project.
Common questions
How much does a new AC system cost in San Antonio?
A full split-system AC replacement typically runs $4,500 to $8,000, while a SEER2-compliant replacement with ductwork work included can run $6,200 to $11,500 or more.
Is a heat pump a good fit for San Antonio homes?
Heat pumps can work well given San Antonio's mild winters and long cooling season, offering efficient heating and cooling from one system, typically costing $7,000 to $13,500 installed.
Do I need a permit for a full HVAC replacement in San Antonio?
Yes, a mechanical permit from the City of San Antonio Development Services Department is required, filed through the BuildSA portal by a registered mechanical contractor, along with a final inspection.
Are there rebates for a new AC or heat pump in San Antonio?
CPS Energy offers HVAC rebates on qualifying central AC and heat pump installs, generally $90 to $310 per ton depending on efficiency tier. Check current program details and required documentation before assuming eligibility.
Why does my ductwork need work when I just want a new AC?
Many older San Antonio homes have undersized or leaky ductwork that was not designed for modern high-efficiency equipment, so a proper replacement quote should include a ductwork evaluation, not just a new condenser and air handler.
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