San Diego, CA Ductless AC Maintenance

Ductless Mini Split Maintenance for Long-Term Savings and System Protection

Ductless systems are reliable and energy-efficient—but only when they’re properly maintained. If your mini split is due for a tune-up, Guthrie & Sons is here to help with professional, affordable ductless maintenance in San Diego, California. We’ll clean the filters, check the components, and keep your system running strong so you can stay comfortable without surprise breakdowns.

Keep It Running Right—Schedule Ductless Maintenance in San Diego Today

If you’ve ever owned a central HVAC system, you already know the drill—maintenance is absolutely necessary. Ductless mini splits are no different. Right now, you may clean the filters and keep the remote batteries fresh. But what else does your mini split need to stay in great shape so it’s not breaking down when you need it most, or wasting energy all year long?

Just like any HVAC equipment, ductless systems have parts that wear, sensors that drift, and coils that get grimy over time. Without a professional tune-up, even a newer unit can start struggling with poor airflow, reduced efficiency, or weird smells. And if you’ve invested good money into your system, it makes sense to protect it.

At Guthrie & Sons Heating, Air & Solar, our ductless mini split maintenance in San Diego, CA, covers everything your unit needs behind the scenes—whether it's cooling, heating, or both. We'll keep it clean, efficient, and performing like it should. Make an appointment today!

There Are Major Benefits to Tuning Up Your Mini Split

There Are Major Benefits to Tuning Up Your Mini Split

Ductless mini splits don’t ask for much—but they do need more than just a filter rinse if you want reliable comfort all year long. With a professional ductless mini split tune-up in San Diego from Guthrie & Sons, you’ll give your system the care it needs to perform better, last longer, and cost less to run.

Here’s what one annual visit can help you do:

  • Boost efficiency and lower your energy bills
  • Prevent surprise breakdowns
  • Get more even heating and cooling in every zone
  • Cut down on dust, odors, and indoor air problems
  • Stop moisture buildup and mold before it starts
  • Extend the lifespan of your equipment
  • Keep your warranty valid and your investment protected
  • Stay confident that your system’s ready for every season

Rest assured, we service all brands and mini split systems. Ready for a ductless unit you can rely on? Let’s book your tune-up!

Join the Mini Split Maintenance Plan that Pays Off—Big Time

Join the Mini Split Maintenance Plan that Pays Off—Big Time

Sure, you could call us every year when you remember… or you can take the easier route. Our USA Membership Plan is built for convenience and packed with savings, especially for ductless mini split owners.

We’ll track your schedule, send you reminders, and handle your mini split tune-ups without you needing to lift a finger. Our plan includes options made just for ductless systems—so you’re not paying for services you don’t need, and you get extra perks where it counts.

Members enjoy:

  • Priority service when things get busy
  • Lower service call fees
  • Discounts on services
  • Seasonal reminders and peace of mind

If your system is under a manufacturer or labor warranty, annual maintenance is a must to keep that coverage intact. This plan makes it easy to stay compliant—while helping your system last longer, work more efficiently, and avoid costly breakdowns. Talk to our team about signing up!

What’s Included in Our Ductless Mini Maintenance Services?

What’s Included in Our Ductless Mini Maintenance Services?

When you book ductless maintenance with Guthrie & Sons, you're getting more than a quick once-over. Our licensed, insured technicians know these systems inside and out.

We take the time to inspect your entire mini split system, clean it thoroughly, test key components, and catch early signs of wear before they become bigger problems. It’s all about keeping your system running smoothly, efficiently, and safely—so you get more comfort and fewer surprises.

Here’s what’s included in every Guthrie & Sons ductless mini split maintenance visit:

We deep clean the indoor and outdoor units to clear away dust, grime, and debris. This helps your mini split run more efficiently, improves airflow, and prevents your system from overworking.

Clogged or backed-up drain lines are a common cause of musty odors, moisture problems, and water damage. We flush the lines and check all connections to keep things clean and dry.

We inspect all wiring, tighten loose connections, and test key electrical components to make sure everything’s safe, stable, and ready for daily use—no shorts or system failures.

We test how your system starts, runs, and stops to confirm everything’s operating as it should. If something’s lagging or off-balance, we can now find it faster.

We check refrigerant levels and system pressure to ensure your mini split is cooling or heating efficiently. Low refrigerant can lead to poor comfort, higher energy bills, or even compressor failure.

We inspect motors, coils, fans, and other parts for early signs of wear. Finding small issues now helps prevent big, costly breakdowns later.

If we spot a larger problem, we’ll let you know and talk through your options. If your system’s getting older, we might suggest a mini split replacement. Either way, we’ll help you choose what’s right for your home and budget.

How Often Should You Schedule Ductless AC Maintenance?

How Often Should You Schedule Ductless AC Maintenance?

Once a year is the sweet spot for keeping your ductless mini split running strong. If you have a ductless mini split heat pump for both heating and cooling, spring or fall is the perfect time—before your system shifts into heavy cooling or heating mode. If you have a ductless air conditioner only, early spring is ideal to make sure everything’s clean, tuned, and ready for summer.

You’re always welcome to book on your own schedule. But if you’d rather not think about it, our USA Membership Plan does the heavy lifting—sending reminders, giving you priority booking, and cutting your costs with member perks. Join the plan or schedule your San Diego mini split maintenance service today!

Frequently Asked Questions

Yes—they may be low maintenance, but they’re not no maintenance. Without yearly service, dust builds up inside the unit, parts wear down unnoticed, and refrigerant issues can creep in. You risk higher energy bills, poor performance, and eventually a breakdown that could’ve been avoided.

You should rinse or vacuum the filters every month or so—more often if you have pets or allergies. But cleaning filters doesn’t protect the internal components. Without proper maintenance once a year, dirt builds up on the coils and in the drain lines, which can lead to water damage, mold growth, or a full system shutdown.

Ideally, never. Refrigerant doesn’t get “used up” unless there’s a leak. But even a small drop in pressure means your mini split has to work harder, which strains the compressor and drives up your electric bill. If you skip annual checks, a hidden leak could burn out your system before you ever realize what’s wrong.

If your system runs nonstop, struggles to cool, or you notice ice buildup on the indoor unit, low refrigerant could be the cause. Letting it run that way wears down your compressor fast, and that’s a costly part to replace. Regular tune-ups help catch this early.

You can—but only if it’s clean, properly charged, and in good working order. These systems are built for steady operation, but if something’s off—like a clogged coil or low refrigerant—you’ll end up with higher bills and more wear and tear. Maintenance keeps your system ready to run safely and efficiently around the clock.

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

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 9/29/25.

  • WATER HEATER

$2,600 Federal Tax Credit on Heat Pump Water Heater

Valid on a qualifying heat pump water heater installation with electrical panel upgrade. Up to $2,000 (30% of cost) in Federal Tax Credits for a heat pump water heater and up to $600 (30% of cost) for an electrical panel upgrade.

Can be combined with state rebates only. Restrictions apply. See dealer for details. Offer valid for an estimate appointment scheduled before 9/29/25.

  • INSTALLATION

Up to $7,750 off a New System

Save up to $4,000 in Tech Clean Equity rebates, up to $1,150 in manufacturer rebates and up to $2,600 in Federal Tax Credits for a total of up to $7,750 off a new installation.

Valid on residential properties only. Cannot combine with any other offers or discounts. Must mention promo at time of estimate appointment. Must be income-qualified to receive Tech Clean equity rebate. Restrictions apply. See dealer for details. Offer valid for an estimate appointment scheduled before 9/29/25.

  • REPAIR

Free Diagnostic w/ a Repair

Your diagnostic service call fee will be waived if you proceed with a repair.

Cannot combine with other offers. Restrictions apply. See dealer for details. Offer expires 9/29/25.

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.

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.
Nick Schoch
17:58 27 May 25
Jonathan recently inspected the HVAC systems at both my front and guest houses, and I couldn’t be more impressed with his service. He was thorough in his assessment, clearly identifying areas of concern and explaining the recommended repairs in a way that was easy to understand. What stood out most was his honesty and patience—he took the time to answer all my questions without rushing, and I genuinely felt he had my best interest in mind. If you're looking for someone who is knowledgeable, professional, and respectful of your time and property, I highly recommend asking for Jonathan.
Neil Domingo
17:24 15 May 25
If you’re dealing with an AC issue, Mario is definitely one of the best! He quickly diagnosed the problem, worked efficiently, and provided a thorough solution. His expertise and professionalism were clear throughout the entire process. Highly recommend Mario for anyone looking to resolve their AC issues with a reliable and skilled technician.
Phil Lane
17:18 10 May 25
Guthrie and Sons has provided great service. There are many HVAC companies in San Diego to choose from. They provided a very reasonable estimate for replacing our two AC systems. Once we said yes installation happened within days. It was a quality install. They answer the phone quickly when I've had questions. Happy to refer them to others.
Dianne Haase
20:57 02 May 25
Great customer service, technicians always on time and friendly. I’ve had my new hybrid heat pump for a few years and Guthrie & Sons are very proactive making sure everything is running smoothly. Very happy in my decision to use them!
Andrea Kossoudji
01:11 30 Apr 25
Great service!! Jonathan was patient, kind, knowledgeable and extremely professional! I love Guthrie & Sons’ reminder system, notification of the technician enroute, the easy invoice system and immediate emailing of the findings, including detailed photographs of the work completed!! Highly recommend!
james beedon
20:47 23 Apr 25
Last summer my air conditioner couldn't cool the house in the hottest period of summer. The HVAC team I was working with came in and said the coils were leaking, the unit was 20 years old. I requested quotes from 5 different companies, and the variation of prices was huge. I went with Guthrie and Sons for these reasons:
1. Local Company
2. Family Owned
3. Great presentation, no pressure
4. Good products
5. Competitive pricing
Just installed yesterday, so jury is still out on the system, but installation was thorough and great communication so far!

Get in Touch with Our San Diego Mini Split Company Today—We’ll Take Care of Your System

Guthrie & Sons Heating, Air & Solar has been helping San Diego homeowners take care of their HVAC systems since 2005. We’re a family-run company founded by our namesake Wes Guthrie and now led by the next generation. Whether you’re in North Park, Chula Vista, or near Mission Valley, our certified technicians show up on time, do the job right, and treat you with respect. You get real service when and where you need it.

Your mini split isn’t just a piece of equipment; it’s what keeps your space comfortable every day. Whether we installed it or not, we’ll help keep it running strong. Schedule your ductless mini split maintenance in San Diego today with Guthrie & Sons Heating, Air & Solar. We’ll help protect your system—and your comfort.

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