San Diego, CA Ductless AC Installation

Enjoy More Comfort, Lower Bills With a Ductless AC Installation in San Diego

Have a central air conditioner that’s costing too much—or no AC at all? If your current system is driving up your bills or you don’t have one yet, ductless mini splits are a smart solution. They’re energy efficient, quiet, and let you control the temperature in each room. We install both single-zone and multi-zone setups, depending on what your home or business needs.

Get a Free Quote for Your Ductless Mini Split Installation in San Diego, CA

If you're upgrading an older home, finishing a garage, converting a guest house, or managing multiple properties, ductless mini split systems offer a flexible and energy-efficient way to heat and cool a space without tearing up walls to run ductwork. These systems use a small outdoor compressor and one or more indoor units to control the temperature in each room, giving you custom comfort and lower energy bills.

And the savings don’t stop there. Many ductless systems qualify for federal tax credits and local rebates that can put money right back in your pocket. At Guthrie & Sons Heating, Air & Solar, we specialize in ductless mini split installation in San Diego, CA. Our licensed team will walk you through your options, help you claim every available rebate, and give you a clear, pressure-free quote. Call us or get started online—it’s fast, free, and always honest.

What is a Ductless Mini Split?

What is a Ductless Mini Split?

Think of a ductless mini split like a space heater and window AC had a smarter, quieter, way-more-efficient baby. It mounts high on the wall, connects to a small outdoor unit, and gives you excellent heating and cooling without needing any ductwork. That means less mess, faster installation, and comfort that’s easy to control by room.

Where can they be installed?

  • Older homes with no ducts in place
  • Converted garages, home additions, or studios
  • Rooms that always seem too hot or too cold
  • ADUs, guest houses, or rental properties
  • Whole homes needing zoned temperature control

At Guthrie & Sons, we install both ductless mini split air conditioners and ductless mini split heat pumps in San Diego homes, so whether you need cooling only or year-round comfort, we’ll help you choose the setup that you need.

How Much Does it Cost to Install a Ductless Mini Split?

How Much Does it Cost to Install a Ductless Mini Split?

The cost to install a ductless mini split in San Diego depends on how many rooms you want to heat and cool, how complex the setup is, and the type of system you choose. A single-zone setup is typically less expensive than a multi-zone installation, but we’ll walk you through every option.

We offer free in-home estimates and a quick online quoting tool so you know exactly what your project will cost—no surprises. We’ll also help you apply for available tax credits and rebates, take advantage of seasonal specials, and explore financing options that work for your budget. At Guthrie & Sons, we make it easy to get top-quality ductless equipment without overpaying.

Not Sure Where to Start? Our Ductless Installation Services Cover It All

Not Sure Where to Start? Our Ductless Installation Services Cover It All

Still have questions? We’ve got answers—and real, honest guidance to help you decide what’s best for your home.

Ductless mini splits are a smart solution for many San Diego homes, especially older houses in neighborhoods like North Park or Point Loma that were built without central ductwork. They’re perfect for converted garages in Clairemont, home offices in Rancho Peñasquitos, or backyard ADUs in areas like Chula Vista.

If you’ve got a room that always runs too hot or too cold, or if your family has different temperature needs in different rooms, ductless gives you personalized control without tearing up your walls.

We start with a free in-home visit anywhere in San Diego County to check out your space and learn what you want to heat or cool. From there, we’ll recommend a single-zone or multi-zone mini split based on how many areas need coverage. Installations usually take one day for simpler setups, two for larger homes.

We mount the indoor unit(s) high on the wall, run a slim refrigerant line to a compact outdoor unit, and keep everything clean. No ductwork, no drywall mess—just a quiet, powerful HVAC system that we know you’ll be happy with.

Look for high SEER, or Seasonal Energy Efficiency Ratio, ratings (18 or higher is excellent for cooling efficiency in San Diego’s long warm seasons) and solid HSPF, or Heating Seasonal Performance Factor, ratings (above 9 is ideal for efficient winter heating on those chilly coastal mornings).

Also consider noise levels (some run whisper-quiet at 19 decibels), smart thermostat compatibility, and coverage area. We'll walk you through all of it. Many of our systems qualify for federal tax credits and SDG&E rebates, and we’ll help you apply to lower your total cost. We only install top brands that we trust in our own homes, so you can count on lasting comfort.

Not at all. One of the perks of a ductless mini split is how easy and affordable it is to maintain. There are no ducts to clean, and the systems are built to be efficient and low-hassle. A yearly tune-up is usually all it takes—clean the filters, check refrigerant levels, and inspect the electrical connections. Regular maintenance keeps things running smoothly and protects your system warranty.

No matter where you are in San Diego—from the coast to the canyons—our team is here to help you stay comfortable. Whether you're just starting to explore ductless or you're ready for a quote, we’ll give you honest guidance, upfront pricing, and a system that’s right for your space.

Contact us today to discuss your ductless mini split installation in San Diego, CA!

Prevent Breakdowns and Fix Problems Fast with Our Ductless Mini Split Maintenance Services

Prevent Breakdowns and Fix Problems Fast with Our Ductless Mini Split Maintenance Services

With proper care, a ductless mini split system can last 15 to 20 years or longer. But the key is maintenance. Letting a struggling unit run without service—especially if it hasn’t had a tune-up in a while—can lead to bigger problems and shorten its lifespan.

That’s why we always recommend calling a professional mini split company at the first sign of trouble. We also suggest scheduling a mini split tune-up once a year to keep everything running at peak efficiency, avoid costly breakdowns, and extend the life of your system. We have all the ductless mini split services you need, including:

  • Mini Split Repair: If your mini split is leaking, blowing warm air, making odd noises, or not responding to your remote, we can help. We find the issue fast and offer expert mini split repair options.
  • Mini Split Maintenance: During your ductless maintenance service, we clean the filters, inspect the refrigerant lines, check the electrical components, and make sure each zone is performing the way it should.
  • Mini Split Replacement: If your system is older, struggling to keep up, or out of warranty, we can help you upgrade to a high-efficiency model that better fits your home’s needs.

Want your ductless mini split to last longer, run better, and cost less to own? Our USA Maintenance Plan has convenient options specifically for mini split systems. You’ll get annual tune-ups, priority service, member-only discounts, and more. Talk to our team about signing up and better protecting your investment right from the start.

Frequently Asked Questions

Absolutely—especially if you don’t have existing ductwork or need to heat and cool specific rooms more efficiently. Ductless systems give you strong, consistent comfort without the mess or cost of major construction. For many San Diego homes, they’re a smarter long-term investment than traditional HVAC.

Ductless mini splits let you control the temperature in each room, save energy, and enjoy quiet operation. No bulky ducts, no hot spots—just targeted comfort where you need it most. They also tend to be more efficient than older central systems and can even qualify for rebates and tax credits.

They do cost more upfront than window units or baseboard heaters, and some folks don’t love the look of the indoor unit on the wall. But today’s systems are much sleeker than older models—and most homeowners forget they’re even there once they feel the difference in comfort.

Ductless systems might seem simple, but installation is not a DIY job. You’ll need the right tools, training, and permits to handle refrigerant lines and electrical connections. Professional installation ensures the system runs safely, efficiently, and lasts as long as it should—with your warranty fully protected.

A single-zone system is great for one room or area, while a multi-zone setup can handle up to 4–8 rooms depending on your layout and unit size. Whether you need comfort in a single bedroom or an entire home, we’ll help design a ductless system that’s just right for your space and lifestyle.

Heating and Cooling Offers You Can't Miss

Big savings, same great service. See what offers are available now in Carlsbad for our favorite customers.

  • INSTALLATION

*Anniversary Sale*
20% Off GulfCoat Coating

In honor of our 20th anniversary, you can get 20% off GulfCoat coating for your heat pump or air conditioning system ($190 value). This protective coating resists condensation and moisture from sea spray, humidity and other harsh environmental conditions while helping to extend the life and efficiency of your system. Not valid on HVAC rooftop or package units. Can be combined with 20% anniversary sale offers only. Restrictions apply. System must be coated by 10/31/25 to receive this offer.

  • INSTALLATION

*Anniversary Sale*
20% Off Insulation and Ductwork

In honor of our 20th anniversary, you can get 20% off ductwork and insulation. Increase the airflow and energy efficiency in your home. Valid on residential properties only. Can be combined with 20% anniversary sale offers and Federal Tax Credits only. Must mention offer at time of estimate appointment. Restrictions apply. See dealer for details. System must be installed by 10/31/25 to receive this offer.

  • INSTALLATION

*Anniversary Sale*
20% Off a New System

In honor of our 20th anniversary, you can get 20% off a new heater, air conditioner, or water heater installation. Valid on residential properties only. Not valid on HVAC rooftop or package units. Can be combined with 20% anniversary sale offers and Federal Tax Credits only. Must mention offer at time of estimate appointment. Restrictions apply. See dealer for details. System must be installed by 10/31/25 to receive this offer.

  • INSTALLATION

0% APR for 24 Months

Get 0% APR financing for 24 months on a new heating or air conditioning installation. 0% interest with 24 equal monthly payments.

Financing subject to credit approval. Valid on select systems only. Valid on residential properties only. Cannot combine with other offers. Must mention promo at time of estimate appointment. Restrictions apply. See dealer for details. Offer valid for an estimate appointment scheduled before 10/31/25.

Real Reviews From Real Customers

We do things differently, and our customers appreciate it. See what some of our thousands of satisfied customers have to say about working with us.

Rachel Phillips
22:24 02 Oct 25
We recently had our A/C replaced by Guthrie & Sons, and I cannot recommend them highly enough. After getting five different bids, Guthrie & Sons stood out immediately—not just on price, but on expertise and professionalism. They even brought their engineers out to ensure the work could be done the right way, which gave us tremendous peace of mind.

From start to finish, their team was outstanding. They worked incredibly hard, treated our home with respect, and left everything spotless—truly the cleanest job site I’ve ever seen after a major project. The installation itself was seamless, and the quality of their work shows in every detail.

If you’re looking for a company that combines deep knowledge, excellent craftsmanship, and genuine care for their customers, Guthrie & Sons is it. Absolutely five stars across the board!
Liz Staff
17:27 02 Oct 25
We had a wonderful experience with Guthrie and Sons. Anthony was our estimator and he did a very thorough job of explaining all of our options! Matthew, Bryan, and Isaiah were our installers and they were very efficient, capable, and personable. Our home did not have an existing HVAC system so they had to build the whole thing in an older house that had undergone several additions. We were up and running in just three days. They left the worksite clean at the end of each day. We highly recommend Guthrie and Sons!
Neil Domingo
18:09 27 Sep 25
Kareen did an outstanding job with our HVAC system. From start to finish, he demonstrated professionalism, patience, and a strong commitment to getting the job done right. Even when faced with several unexpected challenges, he handled each one with skill and determination, never compromising on the quality of his work.

What really stood out was his problem-solving ability and willingness to go the extra mile to ensure everything was operating as it should. He communicated clearly throughout the process, kept us updated, and made sure we felt confident in the work being done.

It’s not often you come across someone who combines technical expertise with such a strong work ethic and positive attitude. We’re very grateful for his efforts and would highly recommend Kareen to anyone needing reliable HVAC service.
Trae Washburn
02:56 16 Sep 25
Professional from beginning to end

Vlad came out to provide an estimate and was able to size an HVAC system that worked well for my house.

They installed it quickly, without issue and helped me set up an app on my phone to control.

The system is working great to heat and cool my house and is whisper quiet.

Highly recommend going with Guthrie and Sons if you want a high quality experience for large and important purchases.
David Maycock
01:10 08 Sep 25
Our two old furnaces needed replacing and so we contacted Guthrie & Sons because of their good reputation. They sent Zach the next morning. He quickly verified that our two furnaces were beyond repair and Guthrie could supply and install suitable replacement funaces. He also suggested and explained alternative solutions, but we eventually decided to go ahead with furnace replacement. As soon as we notified Guthrie & Sons of our decision they arranged for Cristian and Pablo to come to our house the next day. They did a good job, explained clearly how to operate the new furnaces and thermostats, and were respectful of our house.
Erin Guthrie
19:21 03 Sep 25
Daniel was quick and professional. Fixed our AC problem in an hour and the price was very transparent and beyond fair. Didn’t push the subscription maintenance service, simply said it would be a good idea due to the age of our unit. Highly recommend!
Tomankhamen
18:03 28 Aug 25
We had to replace a thermostat that had gone bad. In the old days, I could do it myself. Now, though, the programming of the thing requires technical knowledge that I don’t have. The Guthrie guy that did the job was courteous, professional, and as fast as anyone could be. This has been our experience with Guthrie & Sons for every repair, retrofitting, and equipment replacement that they’ve done for us over quite a number of years now.
Gabrielle Benjamin
18:15 25 Aug 25
Carson Snyder and co-worker (Pablo?) did a great job on the installation of the mini-split cassette. They're hard working, they clearly knew what they were doing, polite, cleaned up afterwards, true professionals. I'd gladly recommend these two gentlemen. However, the Company was not good at keeping me informed although I mentioned to the salesman up front that I was information driven. They were short on details and communicated seldom. Anthony did tell me about the government program available that reduced my cost. I wouldn't have known about it if he didn't mention it. The City did approve their work and signed off on the permit which is an indication of the job done right. I think the Company can improve their customer service
robert johnson
00:53 11 Aug 25
Very pleased with the service we received from Guthrie & Sons! Our AC system needed to be replaced after a huge leak. The tech that came out for diagnosis, Mario, took the time to explain the issue to us, as well as our options for repair. They came out on a Saturday to diagnose and it was fixed the following Tuesday. Matthew was the worker that completed the repair and he did an excellent job. Pricing was reasonable. Much more reasonable than the first company we had come out to take a look. We upgraded our system and our SDG&E bill has already gone down. Highly recommend!
K N
15:52 01 Aug 25
Very knowledgeable and professional. Quoted product was high quality and fair pricing. I highly recommend We ended up not going with them only due to the fact we were also getting Solar and ended up going with one company for our project but I would definitely do business with this company in the future if we need it!
LeRoy Lafferty
17:25 31 Jul 25
We had Guthrie and Sons replace our 50 year old house heater with a heat pump. We are very satisfied with the installation performed by Matthew and Andriy. We were impressed with the detail of their work. They paid particular attention to the required sealing and insulating of the system. Even the HERS testing inspector was impressed with their work. We were also impressed by their professionalism and honesty. They gave us an unexpected partial refund off our signed contract.
Nannette Moyer
17:41 29 Jul 25
We have been using Guthrie & Sons for 3 years and I really can’t say enough good things about them. Our technician Mario was incredibly helpful with our most recent AC issue. He spotted the problem quickly and was very knowledgeable when explaining what was happening. I appreciate their honest and fair pricing and would recommend to family and friends. Glad to have an honest company especially with all the price gauging company’s out these days.
Meghan Venanzi
23:31 22 Jul 25
We were incredibly impressed with the prompt and professional service! We called on a Saturday morning, and within just a few hours, a technician was at our home. With the recent heat, getting our AC back up and running was a top priority—and they delivered! Mario clearly explained our options and provided a hassle-free solution that was both quick and effective. The repair was completed shortly after we gave the go-ahead. We’ll absolutely be using them again for any future HVAC needs. Highly recommend this company for their affordability, efficiency, and friendly service—we’re already telling our family and friends! Thanks again Guthrie & Sons!
Laurie Edwards
22:10 16 Jul 25
We were very happy from start to finish. Vlad did a great job in helping us decide what would be best for our house and our needs and the installation crew were the very best. Thank you Guthrie and Sons for a job well done.
Patrice Makovic
17:45 09 Jul 25
Last summer, I used Guthrie and Sons to replace my heating system with a new one and added an air conditioning unit. We also added two different zones in the house to be able to turn the system on independently from one zone to another. From the first contact to the six month maintenance visits, everything has gone smoothly. There were a couple of hiccups, but the company is very responsive and I have never had an issue with them not promptly responding and taking action to figure out and solve any problem. I highly recommend this company.
Carrie Reese
17:06 08 Jul 25
Guthrie & Son's did an amazing job on our new AC units. From sales through install they were all knowledgeable and helpful. They were very quick to get us all setup and when our home posed some unexpected issues they were able to pivot quickly and resolve them. I'd highly recommend them!
Kenneth Adelson
16:04 07 Jul 25
Had use Guthrie in the past for HVAC service, this time had them install a solar attic fan and additional vent. The service, as it had been the first time, was professional, polite, and on schedule. Pricing was fair (and consider that they offered a repeat customer discount without having to be asked). Would be happy to use them again when the need arises.
I offer 4 stars because I'm not a grade inflation sort. Three is sufficient, four is better than average. Five is reserved for knock my socks off amazing in ways I didn't expect - doesn't happen very often.
Patrick Smith
21:42 27 Jun 25
We had central heat and air put in two a year and a half ago. We've need to make a few adjustments to airflow to rooms since then. Each time, they are onsite withing 1-2 days and have resolved the issue each time. Their team is professional and incredibly friendly and knowledgeable. Very happy we went to Guthrie & Sons.
Bennie Beans
15:41 12 Jun 25
Mario was knowledgeable and courteous. He made sure our system would be sized right and that our existing ductwork was able to support the new system. The install team were prompt and efficient. They installed drop cloths and cleaned up inside and out after the job. So far I’ve been very happy with the work Guthrie and Sons have done for us.
Chris Toogood
21:52 06 Jun 25
Great local family business. And you actually get a live person when you call... And the technician was great and they come out quickly. No up selling too. He gave me two different price options on fixing my problem... band aid cheaper way or replacement. Great service.

Talk to Us About Your San Diego Ductless Mini Split Installation

Guthrie & Sons Heating, Air & Solar has been serving San Diego since 2005. Back then, ductless mini splits weren’t nearly as popular—but today, they’re one of the smartest ways to heat and cool your home. We’ve installed hundreds of systems across all kinds of spaces: homes, garages, rentals, additions, and even small businesses.

We’re proud to still be one of the few family-owned HVAC companies in the area. And when you work with us, you’ll feel that difference. We treat people right. We show up on time, respect your space, and give you honest advice. No pressure. No upsell. Just the right solution for your needs—and your budget.

Take a look at our reviews to see how we work, and when you’re ready, reach out for a free quote on your ductless AC installation in San Diego. We’d love to help!

8248 Ronson Road
San Diego, CA 92111
(619) 269-3013
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