Why Your West-Facing Room Stays Hot and How to Fix It.

Updated September 2026

A west-facing bedroom, a bonus room over the garage, or a home office at the end of a long duct run often feels like an oven while the rest of the house stays comfortable. The central thermostat averages the temperature, leaving these spaces to bake in the afternoon sun or struggle against poor airflow.

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.

The Problem with Long Duct Runs and West Walls

Central HVAC systems distribute air through ducts, but friction and heat gain along the way weaken airflow by the time it reaches the farthest rooms. A west-facing wall absorbs heat all afternoon, turning a 20-foot duct run into a radiator before the air even arrives. Over-garage spaces face similar issues, with attic heat seeping through the ceiling and ductwork losing efficiency before the air exits the vent.

Ductless mini splits bypass these problems entirely. A single unit mounted on the wall or ceiling delivers cooled or heated air directly to the room, eliminating the energy loss of ductwork. For one zone, the flat price is $1,500, including materials, labor, and a Home Depot run for touch-up paint if needed. Two zones cost $2,500, and three zones run $3,500, with most installations completed in a single day.

What to Expect During a Ductless Install

The process starts with mounting the indoor unit on an exterior wall, usually near the ceiling to maximize airflow. A small hole is drilled through the wall for the line set, which connects the indoor unit to the outdoor condenser. The condenser is placed on a concrete pad or wall-mounted bracket, typically within 25 feet of the indoor unit to maintain efficiency. Longer line sets or difficult mounting may require an upfront discussion about adjustments to the flat price.

Installations are performed by TDLR-licensed contractors, ensuring compliance with Texas electrical and HVAC codes. Most one- to three-zone systems are installed and tested in a single day, with the crew cleaning up debris before leaving. The system is demonstrated to the homeowner, and any questions about operation or maintenance are addressed on the spot. If the home’s electrical panel lacks capacity for the new circuit, that work is flagged before installation begins, not after.

Questions

Will a mini split cool a room over the garage as effectively as a west-facing room?

Yes. Rooms over garages often suffer from poor insulation and rising heat from the garage below. A mini split delivers conditioned air directly, bypassing the inefficiencies of ductwork and compensating for the extra heat load. The unit’s capacity is matched to the room’s size and exposure during the initial assessment.

Can I add a mini split to a room with existing ductwork, or does the duct need to be removed?

The existing ductwork can remain in place. A mini split operates independently, so there’s no need to modify or remove the ducts unless you prefer to seal them for energy savings. The new system will handle the cooling and heating for that room without relying on the central HVAC.

What if my electrical panel can’t handle the new mini split circuit?

If the panel lacks capacity, that will be identified before installation begins. While a standard hookup is included in the flat price, a panel upgrade is considered adjacent work and would be discussed separately. No surprises are added after the job starts.

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