Boiler Replacement Cost in San Marcos, Texas
Boiler replacement in San Marcos runs about $7,800 for a typical job. Basic installs start near $4,600. High-efficiency equipment with duct or electrical work can reach $10,500.
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San Marcos Weather and HVAC Load
NOAA's 1991-2020 climate normals put San Marcos at 1,620 heating degree days and 2,973 cooling degree days per year. Cooling carries most of the load. Heating equipment gets light use, so a furnace here often outlasts the AC it's paired with. A normal year brings 20 nights at or below freezing and 117 days over 90°F. For a 2,000 sq ft house, this climate points to a heating load somewhere near 35,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 1,620 |
|---|---|
| Cooling degree days / year | 2,973 |
| Nights at or below 32°F | 20 |
| Days above 90°F | 117 |
| Average low / high | 57.2°F / 80.1°F |
San Marcos Housing Stock
Census figures put the median build year in San Marcos at 1998, so a typical house here has about 28 years on it. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. About 8,400 households here own their home, 30.5% of the occupied total. The median home value is $269,700, and median household income is $51,030. We use both figures to adjust labor and pricing for this page.
Between 2020 and 2025, NOAA's Storm Events Database logged 15 hail days and 13 days with damaging thunderstorm winds in Hays County. The largest hail reported was 3 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage.
When Replacement Makes Sense
- The boiler is 20 to 30 years old or more
- Leaks, rust, or pressure that keeps dropping
- Some radiators stay cold
- The pilot or ignition keeps failing
What Moves the Price
- A combi boiler that also makes your hot water
- A new chimney liner or venting
- Condensing or non-condensing boiler
- Pumps, zone valves and the piping around the boiler
- Fuel type: gas, oil or propane
We lowered the national figures about 16% for San Marcos using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- Flushing and refilling the system
- Startup and safety tests
- Venting and fuel hookups
- The new boiler and the piping around it
- Removing the old boiler
Texas Permits, Efficiency Rules and Rebates
Texas is in the DOE's Southeast region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). Expect the contractor to pull a mechanical permit for a replacement job in San Marcos. If a bidder suggests skipping it, move on. Also ask for a Texas license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Ask for a heat-loss calculation. A lot of old boilers are much bigger than the house needs.
- A combi boiler frees up space and replaces your water heater.
- Ask your gas or oil company about rebates on condensing boilers.
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Boiler Replacement Questions from San Marcos Homeowners
How much is boiler replacement in San Marcos?
Plan on $4,600 to $10,500, with most jobs near $7,800. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule boiler replacement in San Marcos?
Between late fall and early spring. With 117 days over 90°F, San Marcos contractors are booked solid all summer, and off-season jobs are easier to schedule and negotiate.
Can I replace a boiler with a heat pump?
Yes, with an air-to-water heat pump or a ductless system. The radiators may need upgrading, because heat pumps run cooler water than boilers.
How long does a boiler last?
A cast-iron boiler can last 25 to 35 years. A modern condensing boiler usually lasts 15 to 20 with yearly service.
Boiler Replacement Near San Marcos
- Kyle $5,400 to $12,200
- New Braunfels $5,400 to $12,400
- Cedar Park $6,500 to $14,800
- Harlingen $4,100 to $9,300
- Missouri City $5,400 to $12,200
- North Richland Hills $5,700 to $13,000
- Flower Mound $7,400 to $16,800
- Rowlett $6,200 to $14,100
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station San Marcos; NOAA Storm Events Database 2020-2025, Hays County. Prices are our estimates, not contractor quotes. Updated 2026.