Furnace Installation in San Antonio — Licensed Contractors, All Major Brands
Since 2016 | Bilingual Team | Financing Available
Your New Furnace Starts With a Team You Can Trust
When you invest in a furnace installation in San Antonio, the equipment is only half the equation. The contractor who sizes, connects, and commissions your furnace determines whether it runs efficiently for 15 years or becomes a recurring problem within 3. EMAX HVAC installs gas, propane, and electric furnaces from every major manufacturer — and we back every job with a 1-year labor warranty on top of the manufacturer’s coverage.
Or a free in-home assessment. Hablamos español.
Why San Antonio Homeowners Trust EMAX HVAC for Furnace Installation
Licensed and Insured — Every Job, Every Time
EMAX HVAC holds an active TDLR license and carries full liability and workers’ compensation insurance. Every furnace installation we perform meets Texas Mechanical Code requirements. You never have to wonder if the crew in your home is properly credentialed.
We install Carrier, Trane, Lennox, Goodman, Rheem, Amana, York, Daikin, Bryant, and every other major furnace manufacturer. We are not locked into a single distributor, which means we recommend the furnace that fits your home and budget — not the one that pays us the highest margin.
Every furnace installation includes a 1-year labor warranty from EMAX HVAC. Manufacturer warranties extend up to 10 years on parts when the unit is registered with the brand after installation — we handle the registration process for you and explain exactly what is covered.
EMAX HVAC is a locally owned company that has been installing and servicing heating and cooling systems across San Antonio since 2016. Our technicians and office staff are fully bilingual in English and Spanish — from the initial assessment call through final walkthrough.
Types of Furnace Installation We Perform
Gas Furnace Installation
Natural gas furnaces are the most common residential heating system in San Antonio. We install single-stage, two-stage, and modulating gas furnaces in upflow, downflow, and horizontal configurations. If your home has an existing gas line, a gas furnace typically offers the lowest long-term operating cost for heating in the San Antonio climate.
Propane Furnace Installation
Homes outside the CPS Energy natural gas grid — particularly in areas like Cordillera Ranch, parts of The Dominion, and rural properties north of Loop 1604 — often rely on propane. We install propane furnaces with the correct orifice sizing and regulator configuration for LP gas. If you are converting from electric to propane, we coordinate the gas line connection.
Electric Furnace Installation
Electric furnaces work well for homes without gas access where a heat pump is not the right fit. They require no combustion venting, which simplifies installation in tight spaces. We install electric furnaces in attic closets, utility rooms, and garages. Operating costs are higher than gas — we give you a realistic comparison before you commit.
Attic and Horizontal Furnace Installation
Many San Antonio homes — especially single-story slab-on-grade construction — require a horizontal furnace installation in the attic. This configuration demands precise mounting, condensate management, and secondary drain pans to protect your ceiling. We install horizontal furnaces with proper clearances and sealed connections to existing ductwork.
EMAX HVAC is a licensed and insured HVAC contractor in San Antonio, Texas, specializing in residential furnace installation for gas, propane, and electric systems. Serving San Antonio, Stone Oak, The Dominion, Alamo Heights, Terrell Hills, Shavano Park, and Cordillera Ranch since 2016, EMAX HVAC installs all major furnace brands including Carrier, Trane, Lennox, Goodman, and Rheem, with a 1-year labor warranty and manufacturer coverage up to 10 years. The bilingual team provides free in-home assessments with transparent pricing and flexible financing through Synchrony Financial.
Our Furnace Installation Process — What to Expect
In-Home Load Assessment
We measure your home’s square footage, insulation levels, window exposure, duct condition, and existing gas line capacity. This determines the correct BTU output your new furnace needs — not a guess based on what was there before. Oversized furnaces short-cycle and waste energy. Undersized furnaces cannot keep up during a cold snap. We size it right.
Equipment Selection and Transparent Quote
Based on the load assessment, we present furnace options across multiple brands and efficiency levels. You see the AFUE rating, estimated annual operating cost, warranty terms, and total installed price for each option — side by side. No hidden fees, no surprise charges on installation day.
Permits and Scheduling
EMAX HVAC pulls all required mechanical permits through the City of San Antonio or Bexar County before work begins. We schedule your installation at a time that works for your household and confirm the appointment window in advance.
Professional Installation
On installation day, we remove and dispose of your old furnace, install the new unit, connect gas and electrical lines, seal all duct connections, and configure your thermostat. Gas furnaces undergo a combustion safety test — we verify gas pressure, check for carbon monoxide, and confirm proper venting before we leave. The entire process typically takes one full day for a standard replacement.
Final Inspection and Warranty Registration
After installation, we walk you through the new system’s operation, replace your air filter, and set the thermostat to your preferred schedule. We register the unit with the manufacturer so your parts warranty — up to 10 years depending on the brand — is fully activated. If your city requires a post-installation inspection, we coordinate that as well.
Furnace Installation Cost — What to Expect in San Antonio
The cost of a new furnace installation in San Antonio depends on the type of furnace, efficiency rating, configuration (upflow vs. horizontal), and any modifications to gas lines or ductwork. As a general range for residential installations:
Standard-efficiency gas furnace (80% AFUE): lower upfront cost, suitable for homes with existing B-vent flue. Good option when budget is the primary factor.
High-efficiency gas furnace (90–98% AFUE): higher upfront cost, lower monthly operating cost. Requires PVC venting (no metal flue). Pays back the difference in 4–7 years depending on usage.
Electric furnace: lowest equipment cost, highest operating cost. Best for homes without gas access where heat pump is not viable.
Every quote from EMAX HVAC includes the furnace, labor, old unit removal, permits, thermostat setup, and warranty registration — no line items get added after you approve. Financing is available through Synchrony Financial for qualified buyers, with monthly payment plans that start during the next billing cycle.
Should You Repair or Replace Your Furnace?
Not every furnace problem requires a full replacement. If your furnace is under 12 years old and the repair costs less than 40% of a new unit, repair is usually the smarter move. Our furnace repair team can diagnose the issue and give you an honest recommendation.
Replace when the furnace is 15+ years old, requires a major component like a heat exchanger, has been repaired more than twice in the past 2 years, or uses a discontinued part that creates long lead times. If you are unsure, we provide both a repair quote and an installation quote so you can compare — no pressure either way.
Not sure if a furnace is the right heating system for your home? Compare all heating system options including heat pumps, dual-fuel, and electric systems.
Furnace Installation in San Antonio and Surrounding Areas
EMAX HVAC installs gas, propane, and electric furnaces throughout the San Antonio metro area. Our service territory includes Stone Oak, The Dominion, Alamo Heights, Terrell Hills, Shavano Park, and Cordillera Ranch. We also serve homes along the Loop 1604 corridor and communities north toward Boerne and Bulverde.
San Antonio’s heating season is short but intense — cold fronts in December through February can drop temperatures below freezing overnight, especially north of Loop 410. A properly sized and installed furnace is not optional during those stretches. Homes in elevated areas like Stone Oak and Cordillera Ranch see some of the coldest overnight lows in the metro and benefit most from high-efficiency gas furnaces.
Whether you need a standard gas furnace replacement in Alamo Heights or an attic horizontal installation in a Dominion custom home, EMAX HVAC has the experience and licensing to handle it. We also provide cooling services for year-round comfort — many homeowners choose to install a new furnace and AC system at the same time to save on labor costs.
Furnace Installation FAQs — San Antonio Homeowners
What size furnace do I need for my San Antonio home?
Furnace size is measured in BTUs and depends on your home’s square footage, insulation, ceiling height, and window area. A typical 1,500 sq ft San Antonio home needs approximately 60,000–80,000 BTUs. We perform an in-home load assessment to calculate the exact size — never a rough estimate based on the old unit’s nameplate.
What AFUE rating should I look for in a new furnace?
AFUE (Annual Fuel Utilization Efficiency) measures how much fuel becomes usable heat. An 80% AFUE furnace loses 20 cents of every dollar to exhaust. A 96% AFUE furnace loses only 4 cents. In San Antonio’s mild winter climate, an 80% AFUE unit may be sufficient. If you want lower utility bills and qualify for utility rebates, 90%+ makes sense. We present both options with projected operating costs.
Can you install a furnace in an attic or crawl space?
Yes. Many San Antonio slab-on-grade homes require horizontal attic furnace installation. We mount the unit on a proper platform with secondary drain pans, seal all duct connections at the plenum, and ensure adequate clearance for service access. Attic installations require extra attention to condensate routing on high-efficiency models — we handle all of that.
What is the difference between single-stage, two-stage, and modulating furnaces?
A single-stage furnace runs at full capacity every time it fires — simple and affordable but less efficient. A two-stage furnace has a low and high setting, running on low most of the time for quieter, more even heating. A modulating furnace adjusts output in small increments to maintain a nearly constant temperature — the most comfortable and efficient option, but also the highest upfront cost.
How does the manufacturer warranty registration work?
After installation, we register your furnace with the manufacturer using your address and installation date. Most brands offer a base 5-year parts warranty that extends to 10 years when the unit is registered within 60–90 days of installation. EMAX HVAC handles this registration for you — we confirm it is active and provide you with the warranty documentation.
Can you convert my home from electric heat to a gas furnace?
Yes, if natural gas service is available at your property. The conversion requires running a gas line to the furnace location, installing proper venting, and potentially modifying the ductwork. We coordinate with CPS Energy for the gas meter connection and pull all required permits. If gas is not available, we can discuss propane furnace options or a heat pump system.
Do you pull permits for furnace installation in Bexar County?
Yes. EMAX HVAC pulls all required mechanical permits before starting any furnace installation in the City of San Antonio or unincorporated Bexar County. Permitted work protects you — it ensures the installation meets code, passes inspection, and does not create issues when you sell the home. We never skip permits to cut corners.
Do I need a new thermostat when installing a furnace?
It depends on compatibility. If you have a basic thermostat and are installing a two-stage or modulating furnace, you will need an upgraded thermostat to access the multi-stage functionality — otherwise the furnace runs in single-stage mode only. We include thermostat assessment in every quote and recommend the most cost-effective option for your specific furnace model.