Replace Your Old Gas Wall or Floor Furnace with a Ductless Mini Split in Round Rock

Updated September 2026 · ATX Mini Split King, Austin and Central Texas

Many homes in Round Rock still use gas wall furnaces or floor furnaces, especially in older neighborhoods, converted garages, and room additions. These systems can be inefficient, noisy, and unsafe as they age. A ductless mini split offers efficient heating and cooling without ductwork. ATX Mini Split King installs these replacements for homeowners across Central Texas, with flat pricing starting at $1,500 for one indoor head. Here is what you need to know before making the switch.

Flat pricing, everything included

Those are materials and labor together, wired to code by a TDLR licensed contractor. Anything non standard gets quoted first, before a single tool comes out of the truck: a very long line set, an electrical panel that needs work, a difficult mount, a roof or masonry penetration, disposal of the old equipment. You hear the number before we start, not after.

What a Gas Wall or Floor Furnace Is and How It Works

A gas wall furnace or floor furnace is a self contained heating unit that is built into a wall or set into the floor, common in older Round Rock homes built before central air conditioning became standard. These units burn natural gas or propane to heat a metal heat exchanger, and a fan or natural convection pushes warm air into the room. They have no ductwork and typically serve only the room they are installed in, though some older homes have one in the living area and another in a hallway.

These furnaces rely on a pilot light or electronic ignition and a thermostat mounted on the wall. They exhaust combustion gases through a vent pipe that goes outside, often through the roof or an exterior wall. Because they only heat, many homeowners in Round Rock also rely on window units or portable air conditioners for cooling. The system is simple and rugged, but it is a single purpose device that takes up floor or wall space and can become a safety concern as it ages.

Honest Pros of a Gas Wall or Floor Furnace

These furnaces are straightforward and durable. Many have been running for decades with basic maintenance. They heat a room quickly because the gas flame is direct and the warm air is released right where you need it. In Round Rock's mild winters, a small gas wall furnace can keep a bedroom or living area comfortable without the expense of running a central system for the whole house. They also do not require electricity for the basic models, so they work during power outages if the pilot stays lit.

For a homeowner who only needs heat in one or two rooms and does not want to install ductwork, a gas wall or floor furnace is a low cost option upfront. They are also easy to repair in many cases, with common parts still available. In older Round Rock neighborhoods like Old Town or in converted garages and additions, these units are often the only heat source, and they can be kept running with a simple annual service call.

Honest Cons and Limits of a Gas Wall or Floor Furnace

The biggest drawback is that these units provide no cooling. In Round Rock, where summer temperatures regularly climb into the upper 90s and humidity is high, having no air conditioning in a room that you use daily is a real hardship. Adding window units or portable ACs is a workaround, but they are noisy, block windows, and use a lot of electricity. The gas furnace itself is also inefficient by modern standards, with much of the heat going up the flue.

Safety is a real concern with aging gas furnaces. Cracks in the heat exchanger can leak carbon monoxide into the living space. The units take up valuable floor or wall space, and the vent pipe can become blocked by debris or animals. They also require a gas line and a vent, which limits where you can place furniture or remodel. In homes with additions or converted spaces, these furnaces are often undersized for the room size or poorly located, leading to uneven temperatures.

Signs That Your Gas Wall or Floor Furnace Is Near the End of Its Life

If you smell gas or see soot around the unit, that is a serious warning. A yellow or flickering flame instead of a steady blue flame indicates incomplete combustion. If the pilot light goes out frequently or the unit takes longer to heat up, internal components are wearing out. Rust or corrosion on the cabinet or around the vent pipe means moisture is getting in, which can lead to heat exchanger failure. Any unusual noises like rumbling or squealing point to a fan motor or burner issue.

Another sign is that the thermostat does not hold the set temperature or the unit cycles on and off too often. If you need to call for repairs more than once a year, it is often more cost effective to replace the unit. In Round Rock, many of these furnaces were installed in the 1960s through 1980s. If yours is that old, it is likely near the end of its safe service life. A licensed contractor can inspect the heat exchanger for cracks, which is a hidden danger.

What a Ductless Mini Split Replacement Involves for This System Type

The crew removes the old gas furnace, caps the gas line, and disconnects the vent pipe. The opening in the wall or floor where the furnace sat is patched and finished to match the surrounding surface. This often involves framing, drywall, and paint. The new mini split system does not use that opening. Instead, the crew installs an indoor wall mounted unit in a suitable location, often on an exterior wall or near a window for easy line set routing.

A small hole about three inches in diameter is drilled through the exterior wall for the line set, which carries refrigerant, and the condensate drain line. The outdoor condenser unit is placed on a concrete pad or wall bracket outside. Electrical work includes running a dedicated circuit from the panel to the outdoor unit. In older Round Rock homes, the panel may need an upgrade if there is no space for a new breaker, which is quoted before work starts. For a single head system, the flat price is $1,500. Two heads cost $2,500, three heads $3,500, all materials and labor included. Non standard conditions like long line sets, awkward mounting, or panel upgrades are quoted upfront.

When NOT to Switch: Keep Repairing or Stay Ducted

If your gas wall furnace is less than 10 years old, works reliably, and you already have window units or a separate cooling system for the room, repairing it may be the cheaper choice. A simple thermocouple or gas valve replacement costs far less than a new mini split. Also, if you plan to sell the home in the next year or two, some buyers prefer the familiarity of a gas furnace, though that is changing. In a historic home where you want to preserve the original architecture, patching the wall opening may be undesirable.

If you already have ductwork in the home and a central air conditioner, adding a mini split for one room may not be the best use of money. Instead, consider repairing the existing system or adding a ductless unit only if the room is unconditioned. Waiting a season is wise if your current furnace is working but old, as you can plan the replacement during cooler months when demand is lower. ATX Mini Split King will give you an honest assessment over the phone at (512) 297-7493 before any work begins.

Questions people actually ask

Do I need to remove the old gas furnace myself before you install the mini split?

No. ATX Mini Split King handles the removal of the old gas wall or floor furnace as part of the replacement. We cap the gas line, remove the vent pipe, and patch the opening in the wall or floor. The price for a one head system is $1,500 and includes all labor and materials for removal and installation. Anything non standard, like a panel upgrade, is quoted before we start.

Will a mini split heat my room well during a Round Rock winter?

Yes. Ductless mini splits provide both heating and cooling. They use a heat pump that works efficiently even when temperatures drop into the 20s, which is typical for Central Texas winters. The heat is steady and quiet, unlike the blast of hot air from a gas furnace. If you have a mild winter like most years in Round Rock, a mini split will keep the room comfortable without the safety concerns of a gas flame.

How long does the installation take for a typical replacement?

Most single head replacements are completed in one day. The crew arrives in the morning, removes the old furnace, patches the wall, mounts the indoor unit, sets the outdoor condenser, runs the line set and electrical, and tests the system. By late afternoon, you have working heating and cooling. Two or three head systems may take a day and a half. Any delays, like needing a panel upgrade, are discussed and quoted before the job.

What if my gas furnace is in a closet or a tight space?

That is common in Round Rock homes with converted spaces or additions. The crew will work around the space to remove the furnace safely. The new indoor unit is placed on an exterior wall where the line set can run directly outside. If the closet is deep enough, the indoor unit can sometimes go on the same wall. We quote any awkward mounting or long line sets before starting. The flat prices of $1,500, $2,500, and $3,500 cover standard installations.

Can I keep the gas line for a stove or other appliance?

Yes. We only cap the gas line at the furnace location. The rest of your gas piping stays in place for other appliances like a stove, water heater, or dryer. If you want the gas line completely removed from the wall, that is an additional task quoted separately. Most homeowners leave the capped line in place behind the patched wall, which is safe and common.

Keep reading

Every replacement guide we have written is listed on the replacement guide hub. Next door to this page: replacing a gas wall furnace or floor furnace with a ductless mini split in cedar park, replacing a gas wall furnace or floor furnace with a ductless mini split in georgetown. Pricing, service area and the quote form all live on the ATX Mini Split King home page, and the Austin mini split cost guide covers what the rest of the market charges.