Heating and cooling in one
A mini split is a heat pump, so the same system cools your home in summer and heats it in winter — no separate furnace and AC.
Bay Area Ductless Mini Split Installation · Licensed · 13+ Years
Ductless Mini Split Installation in the San Francisco Bay Area
Heating and cooling for homes without ductwork — a ductless mini split delivers both from a compact system, with independent control for each room and no ducts to run.
Free estimateLicensed (CSLB #1022608)Heating & cooling, no ducts13+ years experience
Free on-site estimate · No pressure · We come to you
Why It Matters
Heating & Cooling
Without the Ductwork
A ductless mini split is a heat pump system that both heats and cools — an outdoor condenser connects to one or more slim indoor units mounted on the wall or ceiling, linked by refrigerant lines that run through a small hole in the wall. No ducts, no major remodeling. Each indoor unit controls its own room, so you condition the spaces you're using instead of the whole house.
That makes it a natural fit for a lot of Bay Area homes: older houses that never had central ducts, additions and ADUs, converted garages and sunrooms, and rooms that are always too hot or too cold. It's one of several ways we help homes stay comfortable — see our full heating and cooling services, or a whole house fan if free evening-air cooling is what you're after.
- Both heating and cooling in one system
- No ductwork to install or remodel for
- Independent temperature control per room
- Ideal for additions, ADUs, and older homes
- Compact indoor units, quiet operation
- Condition only the rooms you're using
How It Works
What a Ductless Mini
Split System Includes
It's a compact, flexible system — here's what makes it up and what it does.
Outdoor + indoor units
One outdoor condenser connects to slim indoor air-handling units mounted on the wall or ceiling in the rooms you want to condition.
No ducts — just refrigerant lines
Instead of ductwork, thin refrigerant and electrical lines run through a small hole in the wall, so there's no duct system to build.
Room-by-room zones
Each indoor unit controls its own space independently, so you can set different temperatures in different rooms — and only run the ones you're using.
Quiet operation
The indoor units run quietly, and the noisy compressor sits outside — a big difference from a window unit rattling in the room.
Efficient inverter technology
Mini splits use inverter-driven compressors that ramp up and down to match the load, and skipping ducts avoids the energy lost through duct leaks.
Is It Right for You?
Signs Your Home Is a
Good Candidate
Mini splits solve problems that ducted systems can't. These are the strongest signs one's a fit.
No existing ductwork
If your home has no central ducts — common in older Bay Area houses — a mini split gives you real heating and cooling without building a duct system.
A room addition or ADU
Additions, ADUs, converted garages, and sunrooms are hard to tie into central HVAC — a mini split conditions them on their own.
Rooms that are always too hot or cold
If certain rooms never get comfortable no matter the thermostat, a dedicated mini-split zone fixes that specific space.
You want per-room control
If different people want different temperatures, or you'd rather not heat and cool empty rooms, zoned control saves comfort and energy.
You're relying on window units
If you're getting by with noisy window ACs or space heaters, a mini split is a quieter, more efficient, year-round replacement.
You'd rather avoid duct remodeling
Adding ducts to a finished home is invasive and costly — a mini split delivers the same comfort without tearing into ceilings and walls.
How We Work
Our Ductless Mini Split Installation Process
A mini split performs when it's sized and placed right. Here's how we handle every install.
Free assessment
We look at the rooms you want to condition, the layout, and the best spots for the indoor and outdoor units, and confirm what your home needs.
Size & select the system
We calculate the heating and cooling load and recommend a single-zone or multi-zone system and the right unit placement for even comfort.
Mount the units
We mount the indoor air-handling units and set the outdoor condenser, drilling a small, sealed pass-through for the lines.
Run & connect the lines
We run the refrigerant and electrical lines, connect and charge the system, and seal the wall penetration cleanly.
Commission & walkthrough
We test heating and cooling, confirm each zone works, clean up, and show you how to run it and the controls.
Free assessmentLicensed (CSLB #1022608)Sized & placed right
Why Attic Pros
The Bay Area's Trusted
Home Comfort Team
For over 13 years, Bay Area homeowners have trusted us to keep their homes comfortable — because we recommend the right system for the space, install it properly, and stand behind the work.
- Licensed contractor (CSLB Lic. #1022608)
- Diamond Certified & Angi Super Service Award winner
- Independently reviewed — verified Google ratings
- Right-sized, well-placed installation
- Free, no-obligation on-site assessment
- Local team with 13+ years in Bay Area homes
Real Customers, Real Results
Trusted by Bay Area Homeowners
4.8
★★★★★
Based on 1,900+ verified Google reviews — trusted for home comfort & HVAC services across the Bay Area
Google Review
★★★★★
These guys are awesome. Super clear comms to schedule, then received an extremely thorough consultation. We eventually decided to go with them as other shops in the area didn't communicate as well as Attic Pros.
Pedro Kroeff
Google Review
★★★★★
Tom from Attic Pros was great to work with! He was friendly, professional, and thorough during the inspection. He clearly explained everything he found and answered all of my questions. The whole process was straightforward. Thank you, Tom!
Daria Baevski
Google Review
★★★★★
Finding out we had a rodent infestation for the first time was incredibly stressful, but Attic Pros made the entire process so much easier! Jeremy was very knowledgeable when help preparing the estimate and the work that needed to be done. Their team that came to perform the work—Nico Otten, Juan Rodriguez, and Antonio Lopez—were amazing from start to finish. Communication was fantastic right from the beginning. The crew was super fast, highly efficient, and left everything very clean after sanitizing our attic, crawl space, and garage. They definitely gave us total peace of mind. They were also able to finish in one day!!
Annie M
Google Review
★★★★★
Our small cottage has a very narrow attic entrance. Denis from Attic Pros was willing to try and was able to enter to clean, vacuum, and replace the old insulation. Very professional, access areas were well shielded and protected. Powerful vacuum and clean up well after themselves.
Morgan Yang
Google Review
★★★★★
Tom Best came to our house to give us an estimate on new insulation. He was on time, very thorough and provided a detailed very reasonable estimate within an hour of his visit. What more could you want?
B Kellar
Google Review
★★★★★
Samim great service my attic was left very clean meticulous. I am so happy with the work that him and his team did great service. I recommend them highly. I would give them a 10 if I could.
Darlene Galindo
QUESTIONS, ANSWERED
Frequently Asked Questions
Straight answers to the questions people actually ask about ductless mini splits — heating and cooling, ductwork, zones, and noise. Still unsure? Our team is happy to help.
Still have questions?
Talk to our team — we're here to help.
(800) 543-0382It's a heat-pump system that heats and cools without ducts. An outdoor condenser connects to one or more slim indoor units mounted in your rooms, linked by refrigerant lines through a small hole in the wall. Each indoor unit conditions its own space, so it's flexible and doesn't require a duct system.
Yes — that's a key advantage. Because it's a heat pump, the same system provides air conditioning in summer and heating in winter, so you get year-round comfort from one unit instead of a separate furnace and AC.
No — that's the whole point of 'ductless.' A mini split doesn't use ducts at all, which is why it's ideal for older homes that never had central HVAC, additions, ADUs, and converted spaces where adding ducts would be invasive and expensive.
It's flexible. A single-zone system pairs one outdoor unit with one indoor unit for a single room, while a multi-zone system runs several indoor units off one outdoor condenser to condition multiple rooms independently. We size it to the spaces you want to cover.
They're designed to be. Mini splits use inverter-driven compressors that continuously adjust to the load rather than cycling fully on and off, and because there are no ducts, they avoid the energy typically lost through duct leaks. Zoning also lets you avoid conditioning rooms you aren't using. Actual efficiency depends on the equipment and your home.
No — the indoor units are quiet, and the compressor (the loud part) sits outside. It's a noticeable improvement over a window AC unit running in the room.
A multi-zone mini split can condition multiple rooms with several indoor units, and for many homes that covers the whole house. Whether one system fits or you'd combine it with other equipment depends on your layout and load, which is what we assess on site.
A single-zone system is often installed in a single visit; a multi-zone setup with several indoor units takes longer. Timing depends on the number of units and the line runs. We'll give you a clear timeline with your estimate.
LOCALLY OWNED AND OPERATED
Serving the Greater Bay Area & Sacramento Area
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Tell us which rooms you want to heat and cool and we'll assess your home, size the system, and give you a clear, no-pressure estimate.