Furnace Installation in San Antonio, TX

Most furnaces last 15 to 20 years. If your system is over 15 years old, needs frequent repairs, or your heating bills keep climbing, replacement is usually smarter than another repair. A good rule of thumb: if a repair costs more than a third of a new system — or your furnace is past the 15-year mark — it's time to talk about replacement options.

AFUE (Annual Fuel Utilization Efficiency) measures how efficiently a furnace converts fuel into heat. An 80% AFUE furnace converts 80% of its fuel to heat, while 20% is lost. Modern high-efficiency furnaces reach 95-98% AFUE, which can significantly lower your winter heating bills compared to an older 60-70% AFUE unit.

Several factors determine the cost of a new furnace: the size and capacity your home needs, the efficiency rating (AFUE) you choose, the condition of your existing ductwork, and required permits and code upgrades. We'll evaluate your home and give you straightforward options — never a one-size-fits-all quote.

We start with a free in-home assessment, including a room-by-room heat load calculation per ACCA Manual J run in AirMatch software — your furnace is sized to your home, never guessed. On installation day, we protect your floors, remove the old equipment, install the new furnace, connect and test everything, and walk you through the thermostat and maintenance. Most installations are completed in a single day.

A new furnace is an investment, and we offer financing options to fit your budget. Ask us about monthly payment plans that let you enjoy reliable heat now while spreading the cost over time. Call (210) 306-4205 to discuss what works for you.

We install furnaces from major trusted brands known for reliability and efficiency. Rather than pushing a single manufacturer, we recommend the system that best fits your home, budget, and comfort goals. Every installation is backed by our workmanship and the manufacturer's warranty.

Don't wait for a breakdown on the coldest night of the year. Call So Tex Indoor Air Comfort at (210) 306-4205 for same-day service during business hours, or get an Instant Quote online now.