Gas furnace replacement cost in San Antonio, TX
Installed, 80,000 BTU, 95%+ efficiency
A typical furnace (80,000 BTU, 95%+ efficiency) costs about $4,800 installed in the San Antonio area, 1% below the national figure, because HVAC technicians here earn a median $28 an hour against $29 nationally.
Prices by size in San Antonio
| Size | Low | Typical | High | National typical |
|---|---|---|---|---|
| 60,000 BTU, 80% efficiency | $3,650 | $4,100 | $5,350 | $4,100 |
| 60,000 BTU, 95%+ efficiency | $4,350 | $4,700 | $5,650 | $4,750 |
| 80,000 BTU, 80% efficiency | $3,700 | $4,000 | $4,950 | $4,050 |
| 80,000 BTU, 95%+ efficiency | $4,400 | $4,800 | $5,850 | $4,850 |
| 100,000 BTU, 80% efficiency | $3,900 | $4,200 | $5,400 | $4,250 |
| 100,000 BTU, 95%+ efficiency | $4,550 | $4,950 | $5,900 | $4,950 |
Local labor: what HVAC technicians earn here
| Hourly wage | San Antonio metro | United States |
|---|---|---|
| 25th percentile | $22 | $23 |
| Median | $28 | $29 |
| 75th percentile | $36 | $37 |
The San Antonio market
San Antonio's Development Services Department requires a permit to install water heaters and HVAC equipment, and only state-licensed contractors can get electrical, mechanical or plumbing permits. Its pages do not mention a homestead homeowner exception. Water heater replacement has an unusual path: under the Limited Service and Repair (LSR) permit, a licensed plumbing contractor may do the work first and obtain the permit within three working days of finishing to avoid a penalty fee. The LSR fee is a $57.50 plumbing base fee, an $11.50 processing fee and a 4% surcharge. After an LSR permit issues, the owner may request a free DSD inspection within 30 days through the BuildSA portal. HVAC replacement is not addressed separately. EIA found 83% of Texas homes use central air. New Braunfels and suburban cities issue their own permits.
Furnaces are the main heat in 61% of Texas homes, and San Antonio winters are short, so the furnace runs far less than the AC. That light use means an older furnace can outlast its AC partner. When only the AC fails, ask whether the furnace blower and coil will work with the new outdoor unit. Get the AFUE and the permit number on your invoice.
Permits in San Antonio
| Permit for this job | Yes (general: installing HVAC equipment requires a permit; replacement not addressed separately) (source) |
|---|---|
| Fee | Plumbing LSR: $57.50 plumbing permit base fee + $11.50 processing fee + 4% Development Services/Technology surcharge. Home Remodeling FAQ (2019): plumbing $50 + per fixture; mechanical $50 + per mechanical fixture. |
| Who can pull it | State-licensed contractor for plumbing/mechanical permits |
| Inspection | On request for LSR water heater permits (owner may request a DSD inspection within 30 days); HVAC unclear |
Rebates in Texas
HEAR: announced, not open yet. HOMES: announced, not open yet. Source: Texas State Energy Conservation Office (Comptroller), checked October 13, 2026.
What these programs cover, and other states
Other systems in San Antonio
- Gas tank water heater
- Gas tankless water heater
- Central air conditioner
- Heat pump (ducted, outdoor unit + air handler)
Gas furnace cost in other metros
Sources
- City of San Antonio: Home remodeling permit FAQ
- City of San Antonio IB 121c: Limited Service and Repair permits
- Texas Comptroller: State Energy Conservation Office
- EIA, 2020 RECS: Highlights for space heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for water heating in U.S. homes by state
- EIA, 2020 RECS: Highlights for air conditioning in U.S. homes by state
- BLS OEWS May 2025, San Antonio-New Braunfels, TX (49-9021 HVAC mechanics and installers)
- DOE Consumer Furnaces Final Rule TSD (Sep 2023), Table 8.2.12 (2022$); labor share from App. 8D (11.97 person-hours, $705 of $2,527)