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Mini Split for a Casita
A casita gives your guests their own space. But when Texas heat pushes past 100 degrees, that space can feel like an oven. A mini split system changes that.
Most homes in Central Texas have a single central air system. That system was sized for the main house, not for a detached guest house. Running ductwork to a casita is expensive and often impractical. The result is a building that bakes in summer and freezes in winter.
A mini split solves that. It is a ductless system with two main parts: an outdoor compressor and an indoor air handler. They are connected by a small line set that runs through a three inch hole in the wall. No ducts, no major renovation, no sharing air with the main house.
For a casita, a single zone mini split is the right tool. It cools and heats just that room. Your guests set their own temperature. You do not pay to condition empty space. It is simple, independent, and built for small buildings.
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 Casita Needs Its Own Cooling
A casita is usually a one room building or a small studio. It might have a bathroom or a kitchenette. The walls are often uninsulated or lightly insulated. The roof soaks up sun all day. Without its own cooling system, the indoor temperature can climb well above the outdoor temperature.
Window units are one option, but they block the window, let in light gaps, and are noisy. Portable units take up floor space and dump hot air back into the room through the exhaust hose. Neither gives the consistent, quiet comfort that makes a guest space feel like a real room.
A mini split mounts high on the wall. It blows air across the room without blasting directly on the bed or couch. The outdoor unit sits outside, so the indoor unit is nearly silent. Your guests sleep better and you do not have to listen to a window unit rattling.
- No ductwork needed
- Quiet operation inside the room
- Independent temperature control per building
- Does not block windows or take up floor space
Single Zone Setup for a Small Building
A single zone mini split uses one outdoor unit and one indoor unit. That is all a casita needs. The indoor unit is sized to match the room. A general rule of thumb is that a small casita up to around 400 square feet typically needs a unit in the range of 9,000 to 12,000 BTUs. But every building is different. A site visit with a tape measure and a load calculation confirms the right size.
The indoor head can be mounted on an exterior wall or an interior wall if the line set can run through a closet or attic. The outdoor unit sits on a concrete pad or wall bracket close to the building. The line set is then covered with a plastic chase or run through a conduit. The whole setup is clean and takes up very little space.
For a casita that is used only occasionally, the mini split can be turned off completely when no one is there. That saves energy and wear. When guests arrive, they turn it on and within minutes the room is comfortable. No waiting for a central system to cool down a whole house.
- One outdoor unit, one indoor head
- Sized for the room during a site visit
- Easy to turn on and off as needed
- Clean look with minimal wall penetration
Guest Comfort and Independent Control
The biggest advantage of a mini split in a casita is that the guest controls the temperature. They can set it to 68 degrees at night or 75 during the day. They can run the heat in the winter or the air conditioning in the summer. It is their space and their thermostat.
Many mini splits come with a remote control that lets the guest adjust temperature, fan speed, and mode from the bed or the couch. Some models offer Wi Fi control so you can set the temperature before guests arrive or turn it off after they leave. That kind of flexibility is hard to get with a window unit or a portable cooler.
The indoor unit is quiet. At low fan speed you barely hear it. That matters in a small room where noise carries. Your guests will not be kept awake by a compressor cycling on and off or by a fan rattling in the window frame.
- Guest sets their own temperature
- Remote control included with most units
- Very quiet at low fan speeds
- Heat and cool in one system
Installation Considerations for a Detached Structure
Running a mini split to a detached casita requires running the line set from the outdoor unit to the indoor unit. If the casita is close to the main house, the outdoor unit can be mounted on the house wall and the line set run underground or overhead to the casita. If the casita is farther away, the outdoor unit can be placed next to the casita itself.
The electrical requirements are straightforward. A dedicated circuit of the right amperage needs to be run to the outdoor unit. That work is done by an electrician. The crew handles the line set connections, vacuuming the lines, and testing the system. The whole process usually takes one to two days depending on the distance and access.
The crew will also need to find a good spot for the drain line. Condensation from the indoor unit has to go somewhere. In a casita, the drain can go to a floor drain, a sink drain, or outside through a small tube. The crew will explain the options during the site visit.
- Outdoor unit can go near the casita or on the main house
- Electrical circuit required for the outdoor unit
- Drain line routing discussed on site
- Installation timeline depends on distance and access
Questions People Ask
Can I install a mini split in a casita that has no attic space?
Yes. The line set runs through a small hole in the wall, not through the attic. The indoor head mounts directly on the wall. As long as there is an exterior wall to run the line set to the outdoor unit, it works fine. No attic access is needed.
How is a mini split different from a window unit in a casita?
A window unit sits in the window frame, blocks light, lets in drafts, and is loud. A mini split mounts high on the wall, is nearly silent, and does not block the window. It also provides both heat and cooling, while most window units only cool.
Does the casita need its own electrical panel?
Not necessarily. A mini split typically runs on a dedicated circuit from the main house panel or from a subpanel in the casita. The crew and an electrician will determine the best way to run power during the site visit. It depends on the distance and existing wiring.
Will the outdoor unit be loud for my neighbors?
The outdoor unit makes a low hum when running. It is not silent, but it is much quieter than a window air conditioner or a central AC condenser. Placement matters. The crew will suggest a spot that minimizes noise for both you and the neighbors.
Can I use the mini split to heat the casita in the winter?
Yes. Most mini splits are heat pumps. They provide both cooling and heating down to well below freezing. In Central Texas winters, a mini split keeps a casita comfortable without needing a separate heater. The guest just switches the mode on the remote.
Book the Job
If you have a detached guest house that gets too hot or too cold, a mini split gives you a simple solution. The crew works the I 35 corridor from Waco through Austin down to New Braunfels. Call or text to set up a time for them to come see your casita and talk through the options.
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