Fix Your Hot Upstairs With a Mini Split Heat Pump.

Updated September 2026

An upstairs that stays hot while the downstairs is comfortable is a common problem in two-story homes. Heat rises, and a single central system often cannot keep the second floor cool. A ductless mini split installed directly in the upstairs zone solves this by providing dedicated cooling without ductwork. ATX Mini Split King offers flat-rate installation starting at $1,500 for one zone.

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 Your Upstairs Stays Hot

In a two-story home with a single thermostat on the first floor, the upstairs can easily run 5 to 10 degrees warmer than the downstairs. The central system cycles off based on the lower temperature, leaving the second floor uncooled. Poor attic insulation and limited return air upstairs make the problem worse. A ductless mini split installed in the hallway or a bedroom delivers conditioned air exactly where it is needed, bypassing the ductwork limitations of a central system.

Mini splits are heat pumps, so they cool through brutal Central Texas summers and heat through mild winters without a separate furnace. ATX Mini Split King installs these systems at flat rates that include all materials, labor, and even a Home Depot run for touch-up paint if needed. For a single upstairs zone the price is $1,500, for two zones $2,500, and for three zones $3,500. No custom quotes or in-home visits required, just a straightforward price for a new install.

How a Ductless Mini Split Solves the Problem

Each indoor unit connects to an outdoor condenser via a small line set that runs through a 3-inch hole in the wall. The installation crew mounts the indoor unit high on a wall or under a ceiling, positions the outdoor unit on a pad or bracket, and completes the standard electrical hookup. Most 1-3 zone installs finish in a single day and are tested before the crew leaves. The system operates quietly and can be controlled independently from the central HVAC, giving you targeted cooling for the upstairs.

Our TDLR-licensed contractors handle the entire job. We state any honest exceptions before work starts, never after, such as a very long line set, a panel upgrade the house already needed, or unusually difficult mounting. These exceptions are rare and discussed upfront. The mini split system itself is efficient and low-maintenance, and because it is ductless, it avoids the energy losses common in ducted systems. This makes it a practical long-term fix for an upstairs that will not cool down.

Questions

How long does it take to install a mini split for an upstairs room?

Most single-zone installs for an upstairs room are completed in one day. The crew mounts the indoor and outdoor units, runs the line set, makes the electrical connections, and tests the system before they leave. The exact time depends on the distance between units and how easy it is to route the line set.

Will the mini split interfere with my existing central HVAC system?

No. A ductless mini split operates independently of your central system. It has its own compressor and indoor unit, so it does not affect the ducts or thermostat of the existing system. You can run both together or use the mini split to cool only the upstairs while the central system handles the rest of the house.

Do you need to run new electrical wiring for a mini split upstairs?

Standard electrical hookup is included in our flat price. The crew pulls a dedicated circuit from your main panel to the outdoor unit. If your panel is already full or needs an upgrade to handle the new load, that is an honest exception we discuss before work starts. Most homes built in the last 20 years have room for a standard mini split circuit.

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