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Ductless Mini-Splits
Heating and Cooling Without the Attic
A ductless mini-split is a small outdoor unit connected to one or more wall-mounted indoor units by a refrigerant line that runs through a hole about three inches wide. No ducts, no attic work, no cutting into ceilings. Each indoor head has its own thermostat, so the garage workshop can sit at 78 while the bedroom above it holds 70. Nearly all of them are heat pumps, so the same unit that cools the room in August warms it in January.
In Central Texas they solve specific problems. The garage apartment or casita that was never tied into the main system. The addition or converted porch that the old ductwork could not stretch to. The upstairs bonus room over the garage that runs eight degrees hotter than the rest of the house all summer. The 1960s Austin or San Antonio home with no ductwork at all, where a few heads can replace a collection of window units. And older houses where the attic ducts leak so badly that a ductless system for the main living space is the cleaner fix.
Radiant installs and services mini-splits across both markets. We size each head from the room, run the line sets cleanly, mount the outdoor unit where it can breathe, and vacuum and charge the system by measurement. The quote is in writing and honored for 72 hours, financing is available, and the work is backed by the Home Comfort Guarantee. If a conventional ducted system would serve you better, we will tell you.
- A thermostat per room Cool the rooms you are using and leave the rest alone. No more freezing the living room to make the back bedroom bearable.
- No ductwork, no attic One small penetration per head. Nothing lost to leaky ducts in a 130-degree attic.
- Installed by measurement Line sets pressure-tested, evacuated and charged to spec. Installs over $3,000 get a manager’s quality review.
Is It Right for You
Where a Mini-Split Makes the Most Sense
If one of these sounds like your house, ductless is probably the answer. If none do, a conventional system may still be the better fit.
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A garage, workshop or gym
Tying a garage into the main system is a bad idea for air quality and load. A single head keeps it usable in July without touching the house.
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A casita, ADU or garage apartment
Common across Austin and San Antonio backyards. A mini-split gives the unit its own system and its own bill.
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One room that never cools down
The bonus room over the garage, the west-facing bedroom, the sunroom. A dedicated head fixes it without re-ducting the house.
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An addition or converted porch
The existing system was sized for the old footprint. Adding load to it makes the whole house worse; a mini-split adds capacity where the space is.
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A house with no ducts at all
Older homes running on window units. A multi-zone system replaces them with something quieter, safer and far more efficient.
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A bedroom that wants a different temperature
One person sleeps cold, the rest of the house does not. A single head in the primary bedroom ends the thermostat argument.
What We Do
Mini-Split Installation, Repair and Maintenance
Single-zone and multi-zone systems, installed and kept running.
- Single-zone systems One outdoor unit, one indoor head. The right answer for a garage, casita, sunroom or a single problem room.
- Multi-zone systems One outdoor unit running several indoor heads, each with its own control. For a whole floor or a house without ducts.
- Repair on any brand Communication faults, sensor errors, blower motors, drain pumps and refrigerant leaks, including systems someone else installed.
- Deep cleaning Indoor coils and blower wheels collect a film of dust and biological growth in our humidity. A proper cleaning restores airflow and stops the musty smell.
- Condensate drains and pumps Each head makes water. Gravity drains and lift pumps are checked and cleared so it never ends up running down your wall.
- Seasonal maintenance Mini-splits are covered under Care Club. Filters, coils, drains and charge checked twice a year.
How It Works
From Site Visit to a Cool Room
A single-zone install is usually finished in a day. Multi-zone jobs run a day or two depending on line-set routing.
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We look at the space
Room size, sun exposure, insulation and how the room is used. We pick head locations that cover the room and line-set routes that stay out of sight.
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You get a written quote
Equipment, labor, electrical and any wall or pad work, itemized. Honored for 72 hours, with a monthly financing figure if you want it.
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Install day
Heads mounted, the wall penetration sealed, line sets run and covered, the outdoor unit set, then the system pressure-tested, evacuated and charged.
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Walkthrough
We show you the remote, the modes and how to pull and rinse the filters, then run every head in both heating and cooling before we leave.
Current Specials
Save on the work your home needs most.
Have a Room That Never Gets Comfortable?
A written mini-split quote, honored for 72 hours, with financing on approved credit.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
Our 18 year old HVAC system finally gave out this past week, so we reached out to Radiant to see what could be done. They sent a tech out named Bryan the same day, and he did a great job looking over the entire HVAC system. He was friendly and helpful in explaining everything that he saw, and our options moving forward. We decided to replace the entire system, so we met with Jacob (same day thankfully) to find the best HVAC system for our needs. Jacob was friendly, professional, and did a great job explaining the different options on offer. Radiant was able to set-up next day install, which was much appreciated, because the temps were still going to be cold in the coming days.
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
★★★★★
This is the first time I’ve used radiant my neighbor recommended them…. I called them today and they set me up an appointment on the same day. I was totally shocked at that and the service call was only $39!!…. Highly recommend them Danielle showed up and he was a great guy and he put up with all my wishy-washiness and I had to hurry him because I was heading to church and he got caught in a lot of traffic getting here he even would’ve installed the part that broke but I Didn’t have the time tonight….. He was patient with me and just told me to call the office first thing in the morning and get a service call set up…. Thank you so much Radiant!!….
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
★★★★★
Alex performed the winter service on my unit. This business along with Alex, are very professional and upfront about everything. To be transparent, this is the maintenance included with the purchase of a unit from them. I was informed about everything to include pictures as proof. I was told that my unit is 100% and very clean and again pictures to prove it. I was reccomended this business by a friend and glad he did. The initial purchase experience was also amazing. I had contacted 5 other businesses to get quotes about a new unit as my upstairs unit failed. 2 were outrageous quotes and I am technically still waiting on the other 3. On every instance of getting a quote, I waited about 1 week. Luckily my house has two units but still, un acceptable especially during the summer. I guess they all had so much business they did not care for mine. When I called this business not only did they come out the same day, I had the new unit installed with in 48 hrs. Oh and let's not forget the quote they gave me was the lowest of all. I can say enough good things about this business. Keep up the great work.
Maintenance Membership
Join the Care Club
Home maintenance for $9.99 a month.
Care Club members get two HVAC tune-ups and a plumbing safety inspection every year, priority scheduling, no dispatch fees — ever — and 5% off every repair.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
Ductless Mini-Split Questions
How many indoor heads can one outdoor unit run?
It depends on the outdoor unit. Single-zone systems run one head. Multi-zone outdoor units commonly support two to five indoor heads, and some larger models go higher. The outdoor unit has to be sized for the combined load of every room it serves, and the heads have to be sized for their individual rooms, which is a different calculation than a central system. Putting an oversized head in a small bedroom is a common mistake: it cools the air quickly, shuts off before it dehumidifies, and leaves the room clammy. We size each head from the room and the outdoor unit from the total, and we show you the numbers.
Do mini-splits heat as well as cool?
Almost all of them do. The great majority of ductless systems sold today are heat pumps, which means the same outdoor unit reverses in winter and pulls heat from the outdoor air into the room. In Central Texas, where a hard freeze is the exception rather than the rule, that is plenty of heating for a garage apartment, an addition or a bedroom. Unlike a central heat pump, most mini-splits have no electric backup strips, so on the coldest few nights of the year the output drops somewhat. For the rooms mini-splits are usually installed in, that is rarely a problem, and we will tell you if your situation is the exception.
Do you have to cut a hole in my wall?
One small one per indoor head, about three inches across, usually directly behind or beside the unit where it is hidden. The refrigerant lines, the condensate drain and the control wiring all pass through that single opening, which is sealed and weatherproofed. On the outside, the line set runs to the outdoor unit inside a paintable cover so it looks tidy against the siding or stone. That is the entire extent of the construction. No ductwork, no soffits, no attic access and no drywall repair, which is most of why a mini-split install is measured in hours rather than days.
How do I clean a mini-split filter?
Lift the front cover of the indoor head, slide out the mesh filters, and rinse them under lukewarm water or vacuum them gently. Let them dry fully before sliding them back in. Do this about once a month during heavy use and more often during cedar season or if you have pets. It takes two minutes and it is the single most useful thing you can do for the system: a clogged filter restricts airflow, makes the head noisy and can freeze the coil. What you cannot reach with a rinse is the coil and the blower wheel behind the filters, which pick up a film of dust and growth in our humidity. That is a job for a tune-up, and it is covered under Care Club.
Is a mini-split cheaper to run than window units?
Generally, yes, by a wide margin. A ductless system uses an inverter-driven compressor that ramps its speed up and down to match the load instead of switching fully on and off, and its coils are far larger relative to the room than a window unit’s. It is also much quieter, does not block a window, does not leave a gap for hot air and insects, and can be locked from the outside. For a house in Austin or San Antonio that has been running three or four window units through the summer, replacing them with a multi-zone mini-split usually shows up on the electric bill in the first month. We can walk you through the estimated operating cost on your quote.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
