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Mini Split for a Guest Suite
A guest suite that sits empty most of the year is a waste to keep cool and a gamble to warm up on short notice. A properly sized mini split solves both.
Most guest suites in Central Texas get used a handful of weekends per year. Blasting the central AC for those few days is expensive and unnecessary. Letting the room bake in summer means your guests walk into a space that feels like an oven.
A mini split gives you two things a central system cannot: independent temperature control for that one room and the ability to schedule when it runs. You keep the guest suite at a reasonable setback temperature when nobody is there. Then you bring it down to a comfortable level before your guests arrive.
This approach works best when you plan ahead a few hours. Modern mini splits let you adjust the temperature remotely using a smartphone app. You set the room to 80 or 85 degrees for the weeks it is empty. The day your guests are coming, you drop the setpoint to 72 a few hours before they walk in.
The Price on the Card
That is materials and labor for a standard single zone mini split installation. One day every week is the Joker Day at $2,200. Which day it lands on changes week to week, and the current Joker Day is revealed on the home page.
A $400 materials deposit books the date. The balance is due on completion.
Call the crew: (512) 297-7493Why a guest suite is a different problem than a garage
A garage gym gets used almost every day. A guest suite might go weeks or months between uses. That changes the math on how you run the system.
You do not need the room to be comfortable when nobody is in it. You need it to be comfortable on demand. A mini split is built for that. It can recover from a high setback temperature faster than a central system can, and it only conditions the space you are using.
- Setback mode keeps the room at 80 to 85 degrees when unoccupied
- Remote control lets you start cooling from your phone hours before guests arrive
- No wasted energy on rooms that do not need it
Sizing the mini split for a guest suite
The size of the unit depends on the room square footage, ceiling height, window area, and insulation. A guest suite is usually a bedroom or a small apartment over a garage. Most fall into a range that a small mini split can handle.
As a general rule of thumb, a room under 400 square feet often works with a 9,000 or 12,000 BTU unit. But that is a starting point. We confirm the actual sizing during a site visit. We look at the room layout, check for direct sun exposure, and measure the space. Oversizing a mini split is common and causes short cycling, which wears the unit out and never removes humidity properly.
- We measure the room and check insulation before making a recommendation
- Oversizing leads to poor humidity control and wasted efficiency
- Undersizing means the room takes too long to cool down
Where to mount the indoor head and outdoor unit
For a guest suite, the indoor head usually mounts on an interior wall that has good airflow across the room. You want the air stream to hit the living area, not a closet or a bed corner. The outdoor unit sits on a concrete pad or wall bracket outside, as close as possible to the indoor head to keep the line set short.
Running the line set through an exterior wall is the cleanest install. If the suite is above a garage, we may run the lines up an exterior wall and along the eaves. We keep the outdoor unit out of the way of windows and foot traffic.
- Short line sets mean better performance and fewer places for leaks
- We place the outdoor unit where it is easy to service and drains properly
- Indoor head location matters for even cooling
Setting it back and bringing it down
The real value of a mini split in a guest suite is the ability to run two very different modes. When the room is empty, set the thermostat to 80 or 85 degrees. The system runs just enough to keep humidity in check and the temperature from climbing into the 90s.
When you know guests are coming, turn the unit on a few hours ahead. Most mini splits can drop a room from 85 to 72 in two to three hours, depending on the outdoor temperature and how well the room is insulated. If the guest suite is on the second floor or above a garage, plan for a little more time.
- Setback to 80 to 85 when unoccupied saves energy without damaging finishes
- Pre-cool three to four hours ahead for best results
- Remote control makes scheduling simple
Questions People Ask
How long does it take to cool a guest suite with a mini split?
It depends on the starting temperature, the outdoor heat, and the room size. In general, a properly sized mini split can drop a room from 85 degrees to 72 in two to three hours. If the suite is poorly insulated or gets full afternoon sun, it may take longer. We recommend starting the unit at least four hours before your guests arrive.
Can I set a schedule so the room cools automatically before guests arrive?
Yes. Most mini splits have a timer or scheduling feature built into the remote or a smartphone app. You can program the system to start cooling at a specific time on a specific day. This works well if you know your guests' arrival time in advance. For last minute plans, you can also start it remotely from your phone.
What temperature should I set the mini split to when the room is empty?
A reasonable setback temperature is 80 to 85 degrees. This keeps the room from getting punishingly hot and helps control humidity, but does not waste energy cooling an empty space. In Central Texas summers, setting it higher than 85 may allow mold or mildew to develop, especially in a room that is closed up for weeks at a time.
Do I need to run the mini split all the time in a guest suite?
No. That is the whole point of having a separate system for that room. You can turn it off completely or set it to a high setback temperature when nobody is there. Running it only when needed saves power and wear on the unit. Just allow a few hours to cool the room down before guests arrive.
Will a mini split fit in a guest room with limited wall space?
Indoor mini split heads come in different styles. The most common is a wall mounted unit that needs about 36 inches of clear wall space on a wall that is not directly above a heat source. If the room has no suitable wall, we can look at floor mounted or ceiling cassette units. We measure the room and discuss options during a site visit.
Book the Job
If you have a guest suite that needs to be comfortable on short notice without wasting energy the rest of the year, a mini split is a straightforward fix. Call or text us to schedule a site visit. We will look at the room, talk through how you plan to use it, and put together an install plan that fits.
Call or text the crew at (512) 297-7493. Tell us the room, the size and whether it is insulated, and send a photo of the wall you want the head unit on. Standard days are $2,400, materials and labor. The weekly Joker Day is $2,200, and the home page shows which day it is this week. A $400 materials deposit holds the date and the balance is due when the job is finished.
Call (512) 297-7493