Adding a Mini Split When Ductwork Won’t Reach.

Updated September 2026

A new room sits too far from the existing duct trunk line. Extending it means tearing into ceilings and walls across the house. A ductless mini split lets you add one dedicated zone without the demolition.

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 Duct Extensions Often Cost More Than the Room Itself

Most Central Texas homes built before 2010 have ductwork routed through interior walls or attics. When you add a room on the opposite side of the house, the nearest trunk line might be thirty feet away. Extending ducts requires opening multiple walls, rerouting insulation, and sealing new joints. The labor alone can exceed the cost of the new room. A mini split avoids this by placing a single outdoor unit and one indoor head in the new space.

The flat pricing for new installs covers materials, labor, and a Home Depot run for touch-up paint if needed. One split costs $1,500, two splits $2,500, and three splits $3,500. These prices apply only to new installations, not repairs or service calls. The system includes both cooling for Central Texas summers and heat for mild winters, eliminating the need for a separate furnace.

What to Expect During a Single-Day Install

The outdoor unit mounts on a concrete pad or wall bracket, while the indoor head attaches to the wall or ceiling. A small hole, about three inches in diameter, connects the two with refrigerant lines and electrical wiring. The crew tests the system before leaving, ensuring it cools and heats as specified. Most one-to-three zone installs finish in a single day, assuming no unusual complications like a long line set or a needed panel upgrade.

Installations are performed by TDLR-licensed contractors. Honest exceptions, such as difficult mounting or a required panel upgrade, are disclosed before work begins. The flat pricing includes standard electrical hookup, but additional work like insulation or ductwork demolition is not part of the service. The crew will explain any potential extras upfront, so there are no surprises after the job starts.

Questions

Can a mini split handle a room above a garage or a sunroom with large windows?

Yes, mini splits are sized to match the room’s load. A room above a garage or a sunroom with large windows may require a slightly larger unit, but the flat pricing remains the same as long as the install fits the standard criteria. The crew assesses the space before work begins.

What if the new room is on the second floor and the outdoor unit must sit far below?

A longer line set may be needed, which could add cost. The crew will measure the distance before starting and explain any adjustments to the flat price. Most standard installs assume a line set under fifty feet.

Does the flat price include removing old ductwork or adding insulation?

No, the flat price covers only the mini split installation and standard electrical hookup. Removing old ductwork or adding insulation is separate work. The crew can discuss what to expect, but those services are not included in the quoted price.

We install across Central Texas. See the Austin mini split cost guide, full Central Texas service area or Austin mini split installation.