How Much Does a New Furnace Cost? (2026)

Most Houston homeowners pay between $3,500 and $7,500 for a new gas furnace, fully installed. A basic single-stage unit in an easy-to-reach spot sits near the low end. A high-efficiency, two-stage or modulating furnace — or a job that needs new ductwork, a new flue, or code upgrades — moves toward the top. Larger homes with premium, high-output systems can run $8,000 to $10,000 or more.

Those are honest installed ranges, not a quote. The furnace itself is only part of the price; the rest is labor, permits, materials, and whatever your specific home needs to do the job right. The only way to know your real number is an in-home look at your current equipment, your ductwork, and your square footage. Any company that gives you a firm price over the phone without seeing the job is guessing — and that usually works out in their favor, not yours.

A handful of things move the price up or down, and understanding them helps you spot a fair estimate from an inflated one:

Size (BTU output) and home square footage — a bigger home needs more heating capacity, which costs more. Fuel type — natural gas, electric, or a heat pump each price differently. Efficiency rating (AFUE) — a standard 80% furnace costs less up front than a 95%+ high-efficiency model, though the efficient unit uses less gas over its life. Staging — single-stage is cheapest; two-stage and modulating furnaces cost more but run quieter and hold temperature better. Ductwork condition — leaky, undersized, or aging ducts may need repair or resizing, which adds to the total. Permits and code — the City of Houston and surrounding areas require permits and inspections on furnace replacements, and older homes sometimes need flue or gas-line updates. Whether you replace the AC at the same time — many Houston homes share a coil and cabinet with the AC, so replacing both together is often cheaper per unit than doing them years apart.

Houston is a cooling town, so most homes run their AC far more than their heat. That changes the math on which heating system makes sense.

Gas furnaces are the most common replacement here. They heat fast and cheap to operate when you have a natural gas line, with installed costs typically in the $3,500 to $7,500 range. Electric furnaces usually cost less for the equipment itself but more to run each winter, since electric-resistance heat is expensive per hour — they make sense mainly for homes with no gas service. Heat pumps do double duty as both your heater and your air conditioner, and they're a strong fit for the mild Houston winter. They cost more up front than a basic furnace but can lower your energy bills year-round, which is why more Houston homeowners are choosing them.

Because our heating season is short, don't let anyone push you into the most expensive, top-tier furnace 'to save on winter bills.' The savings are real in a cold northern climate; in Houston, they're much smaller. Match the system to how the equipment actually gets used here.

A new furnace is a real expense, so replacement isn't always the right call. A good rule of thumb: if the repair costs more than about a third of a new system and your furnace is past 12 to 15 years old, replacement usually makes more financial sense. If the unit is younger and the fix is a common part — an igniter, a flame sensor, a blower motor, a control board — repairing it is often the smarter, cheaper move.

Watch for the signs that lean toward replacement: rising heating bills with no change in usage, frequent breakdowns, uneven heating between rooms, a cracked heat exchanger (a safety issue we never take lightly), or a furnace that's simply reached the end of its service life. Because Houston furnaces run far fewer hours than the AC, a well-maintained unit can last on the longer end — which is exactly why an honest technician should tell you when a repair still has years left in it. We'd rather fix your furnace and earn your trust than sell you a system you don't need yet.

The furnace market has its share of high-pressure sales tactics, so protect yourself with a few simple habits. Get a written, itemized estimate that separates equipment, labor, and permits — not one vague number. Ask what size (BTU) and efficiency (AFUE) is being installed and why that size fits your home; correct sizing matters more than brand. Make sure the company pulls the required permit and is licensed and insured — in Texas, ask for the TACL license number (ours is TACLA36229C). And be cautious of quotes that are dramatically cheaper than everyone else's; that usually means a cut corner, a skipped permit, or a mismatched unit that costs you later.

As a family-owned company that has served Greater Houston for over 10 years, we quote honestly, explain your options in plain English, and never upsell you into equipment you don't need. If you want a real number for your home, we'll come look at it and give you a straight answer. Call AIR STAR NOW at (713) 929-9595 — we're available 24/7, including nights, weekends, and holidays.