Mini Split Installation for Guest Houses in Austin.

Updated September 2026

A detached guest house on your Austin property often lacks any existing ductwork. Running a new duct line underground is expensive and invasive. A ductless mini split heat pump solves the problem with a single outdoor unit and one or more indoor wall mounted heads, all installed in one day for a single flat price.

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 Standard for Guest Houses

Guest houses are built as separate structures and almost never share the main home duct system. Trenching a supply and return duct line underground requires excavation, sealing, and insulation work that can cost thousands more than a ductless system. A mini split hangs on the wall inside the guest house and connects to an outdoor compressor via a small line set run along an exterior wall or under a short porch. The whole job finishes in one day, and the system delivers both cooling and heating without any ductwork.

Our flat pricing covers exactly what you need for a standard guest house install. One indoor unit and one outdoor unit costs $1,500. If your guest house has two separate rooms needing conditioning, a two zone install runs $2,500. Three zones for a larger guest house or a detached studio and workshop combination is $3,500. These prices include materials, labor, and a trip to Home Depot for touch up paint if the crew needs to patch a small wall hole.

What a Guest House Install Actually Involves

The crew arrives in the morning and mounts the indoor head on an exterior wall in the main living area of the guest house. They drill a three inch hole through the wall for the line set, which carries refrigerant, power, and condensate drainage to the outdoor unit placed on a concrete pad or wall bracket outside. Standard electrical hookup means connecting the outdoor unit to a nearby breaker panel inside the guest house. If the guest house panel is undersized or needs a full upgrade, that is an honest exception we flag before work starts.

Because the guest house is detached, the crew runs the line set along the exterior wall in a covered line hide or conduit for a clean look. All work is done by a TDLR licensed contractor, and we test the system for cooling, heating, and drainage before we leave. Most single zone guest house installs are finished by late afternoon. The system acts as a heat pump, so it provides air conditioning through Central Texas summers and supplemental heat during the cooler winter months without needing a separate furnace.

Questions

Does the outdoor unit need to be right next to the guest house wall?

It can be up to about 50 feet away with a standard line set. Longer runs count as an exception we discuss before starting work, and we quote the extra cost upfront.

How is electrical power handled for a guest house install?

We connect the outdoor unit to the guest house existing breaker panel using a standard disconnect and whip. If the panel has no open breaker space or is outdated, that is a pre existing condition we note before work begins.

Can the mini split cool the whole guest house if it has a loft or open ceiling?

A properly sized single zone unit can condition an open floor plan up to about 700 square feet. For a two story guest house or a layout with separate rooms, two zones give better temperature control.

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