Room addition and sunroom mini splits.

Updated September 2026

Adding a room, sunroom, or enclosed porch to a home with a central HVAC system usually means stretching that system too thin. The new space never gets comfortable, and the rest of the house pays for it. A dedicated ductless mini split solves this without touching your existing ductwork—and we install it flat-rate, same day, across Central Texas.

Flat pricing, same everywhere we work

Every install is wired to code by our TDLR-licensed contractor. Long line-set runs, panel upgrades or unusual mounting can add cost, and we tell you up front, before any work starts. For market context, see our Austin mini split cost guide: typical Central Texas quotes run $3,000 to $5,000 for a single zone.

Why a mini split is the right fit for additions and sunrooms

Your central system was sized for the original square footage. When you add a room, that system now has to cool and heat more space—but the ductwork wasn’t designed for it. The result: weak airflow in the addition, and rooms farther from the furnace or AC suddenly run warmer or cooler than they should.

A ductless mini split is a self-contained heat pump. It heats and cools the new space independently, with its own outdoor unit and indoor head. Your existing system keeps doing its original job, and the addition gets its own thermostat. No duct redesign, no cutting into walls, no compromise.

What the install involves

We mount a slim indoor unit on a wall or ceiling in the addition, run a small refrigerant line set through an exterior wall, and place a compact outdoor condenser outside. The line set is typically covered with a neat, paintable channel—no major demolition. For sunrooms with high ceilings or lots of glass, we position the indoor head to throw air where you actually sit.

Because we’re a TDLR-licensed contractor, the electrical and refrigerant work is done to code. Standard installs are completed the same day, including the line set, mounting, electrical connections, and a full system test. You get a working zone by the afternoon.

Sizing and what affects the price

Our flat pricing covers materials and labor for a standard install: $1,500 for one zone, $2,500 for two, $3,500 for three. That includes the indoor unit, outdoor condenser, line set, mounting hardware, and electrical disconnect. The price is the same whether you’re adding a 150-square-foot sunroom or a 400-square-foot bonus room—as long as the install is standard.

What changes the price? Non-standard situations: a very long line set run (over 50 feet), needing a new dedicated electrical circuit from the panel, or mounting the indoor unit in a hard-to-reach ceiling. We’ll tell you upfront if your project falls outside flat pricing—no surprises. Sizing is done on-site, not guessed, so you get a unit that matches the room’s heat load, not a one-size-fits-all box.

Questions

Will a mini split really keep up with a sunroom’s heat in Central Texas summers?

Yes. Mini splits are heat pumps, and they’re sized to the room’s actual cooling load—including sun exposure, glass area, and ceiling height. We match the unit’s BTU capacity to that load, so it will hold temperature even on 105°F days. The indoor unit blows cold air directly into the space, not through ductwork that loses cooling in an attic or crawlspace.

Can you install this without cutting into my existing ductwork or central system?

Correct—no ductwork is touched. The mini split is completely independent. We only need access to an exterior wall for the line set and a nearby power source. Your central system stays exactly as it is, and the addition gets its own zone. This also means you don’t have to rebalance dampers or worry about static pressure issues.

What if my addition is already finished—do you have to tear into walls?

No. For finished rooms, we run the line set through a small hole (about 3 inches) in an exterior wall, then cover it with a slim channel on the outside. Inside, the line set is hidden behind the indoor unit. If you have a drop ceiling or an unfinished attic above the addition, we can route the line set there instead. The install is clean, and we patch any small penetrations we make.

We install across Central Texas — see the full service area or the Austin cost guide.