HVAC Maintenance

HVAC Maintenance in San Diego County for Lower Bills and Fewer Breakdowns

HVAC maintenance matters—for your comfort, your system, and your wallet. It keeps your home cool when it’s hot and warm when it’s cold without surprise breakdowns or bloated energy bills. Whether it’s your AC, furnace, ductless mini split, or heat pump, we’ve got the tools and the know-how to tune it up and keep it humming. Wherever and whenever you need HVAC maintenance in San Diego, Guthrie & Sons is ready to do the job—and do it well.

The HVAC Maintenance Service That Saves You From Surprise Repairs

Some things in life are just smart to stay on top of—your oil changes, a yearly physical, and yes, your HVAC maintenance. Whether you just installed a new system or you’ve had yours for years but haven’t kept up with tune-ups, now’s the time. Regular maintenance helps your system run better, last longer, and use less energy day to day.

At Guthrie & Sons Heating, Air & Solar, we’ve been serving San Diego County since 2005, from Oceanside to Alpine, Temecula to Chula Vista. Our NATE-certified team handles heating and cooling maintenance for all types of systems—air conditioners, furnaces, ductless mini splits, and heat pumps. It doesn’t matter who installed your system or how old it is—we’ll keep it working like it should.

Protect the investment you’ve already made and get ahead of future problems. Call today or schedule your HVAC maintenance in San Diego, California, online—it’s fast, easy, and worth it.

Benefits of Regular HVAC Maintenance

Benefits of Regular HVAC Maintenance

Taking care of your HVAC system isn’t just about checking a box—it’s about saving money, avoiding breakdowns, and keeping your home comfortable all year.

Here’s what regular maintenance can help you do:

  • Prevent Surprise Breakdowns: Small issues get caught early, before they turn into expensive repairs or full system failures.
  • Lower Your Energy Bills: A well-maintained system doesn’t have to work as hard, which means it runs more efficiently and costs less to operate.
  • Extend the Life of Your Equipment: Routine maintenance reduces wear and tear, helping your HVAC system perform better for more years.
  • Protect Your Warranty: Many manufacturer and labor warranties require annual service to stay valid—miss it, and you could be stuck footing a big bill.

We recommend annual maintenance for most systems—twice a year if you use the same one for heating and cooling.

Stay Ahead of HVAC Problems With a Plan That Works for You

Stay Ahead of HVAC Problems With a Plan That Works for You

Once your system’s installed, we know how easy it is to let maintenance slip down the to-do list. That’s why we created our USA Membership Plan—to take the guesswork out of keeping your system in shape. We’ll reach out when it’s time to schedule your next tune-up, so you never have to worry about falling behind. As a member, you’ll also get exclusive benefits like discounts on repairs and service calls, priority scheduling, and more.

Remember, if you have a labor or manufacturer warranty, annual maintenance is required to keep it valid. Whether you have a furnace, a furnace and AC combo, or a ductless mini split, we have a plan that fits. Choose from 1-, 2-, or 3-year options depending on what works best for you. It’s a simple, affordable way to protect your system and your comfort. Ready to sign up or have questions? Call us anytime—we’re happy to help.

HVAC Maintenance Services to Keep Your Heating and Cooling Systems Running Right

Your HVAC system needs regular tune-ups to stay efficient, safe, and reliable. Some upkeep—like changing air filters—is simple enough to do yourself. But most of it? That’s what our licensed technicians are here for.

Here’s what we cover during a professional HVAC tune-up, and what you can do in between visits to keep things running smoothly.

When we perform an AC maintenance visit, we start by cleaning the outdoor condenser coils so your system can breathe and run efficiently. We also check refrigerant levels and pressure to make sure your home’s actually getting cool, not just blowing air. Our technicians inspect electrical components, tighten connections, and test your thermostat to ensure the entire system communicates the way it should. We’ll also check indoor airflow and inspect your evaporator coil for buildup that could cause future issues. Every detail gets covered so you’re not caught off guard on the next hot day.

Mini splits need a little extra attention, especially if you’ve got multiple zones running year-round. During your mini split maintenance, we clean the indoor units, including filters, coils, and blower wheels, to keep airflow strong and your system quiet. Outside, we check the condenser for dirt, leaves, or anything that could restrict performance. Refrigerant pressure is tested and adjusted as needed. We also make sure each indoor head is communicating properly with the remote and outdoor unit.

Because heat pumps heat and cool, our heat pump maintenance checklist covers everything—reversing valves, defrost cycles, refrigerant levels, and more. We inspect and clean both indoor and outdoor coils, making sure the system can efficiently transfer heat in either direction. Our team checks the thermostat for seasonal accuracy and verifies that the switch between heating and cooling modes is smooth. We’ll also test motors and electrical components for wear or inefficiency. If anything looks off, we’ll catch it before it becomes a bigger problem.

A good furnace tune-up starts with a thorough safety check. We examine the heat exchanger for cracks, clean flame sensors, and test carbon monoxide levels to make sure your home stays safe. The blower motor gets cleaned and lubricated, while belts and electrical components are inspected for wear. If your system uses natural gas, we’ll check the gas lines for leaks and verify that ignition is working correctly. Once we’re done with your furnace maintenance, your heater will be clean, safe, and ready to keep your home warm when you need it most.

The best thing you can do at home is to change your air filter every 1 to 3 months and keep outdoor units clear of debris. For everything else, call Guthrie & Sons!

From Tune-Ups to Repairs, We’re Your All-in-One HVAC Team

Even with regular maintenance, HVAC systems can still hit a snag. Maybe it’s a strange noise, uneven temps, or just something not feeling right—we’ll come out fast, figure it out, and get your system back on track. It’s normal to occasionally need an HVAC repair between service appointments, and that’s what we’re here for.

Most HVAC systems last 10–15 years or more, especially with consistent care. When yours reaches the end, we’ll help you plan HVAC replacement with a system that saves energy and fits your home. Beyond heating and cooling, we also install and service heat pump water heaters, solar panels, and indoor air quality solutions to make your whole home more comfortable and energy-smart.

Frequently Asked Questions

Spring and fall are ideal—before the heavy-use seasons hit. That gives us time to tune things up so your system performs at its best when you need it most. If you’ve missed those windows, don’t worry—we’ll service your system anytime.

Yes, homes with pets or allergy sensitivities benefit from more frequent service. We recommend checking filters monthly and scheduling tune-ups every 6 months if possible. Cleaner systems mean cleaner air—and better comfort for everyone in the house.

It depends on your system and setup, but we’ll always give you clear, upfront pricing. We also offer maintenance plans to make it more affordable long term. Call us anytime for a personalized quote or to learn about current specials.

Most tune-ups take about an hour to 90 minutes, depending on your system type. We take the time to do it right—cleaning, testing, checking components, and making sure it all works together. We’ll also answer any questions you have while we’re there.

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.

Make an Appointment for Your HVAC Maintenance Today

You’ve already invested in your HVAC system—now it’s time to protect that investment and make it pay you back in lower energy bills, fewer repairs, and better home comfort.

Guthrie & Sons Heating, Air & Solar is a local family-owned company that’s been serving San Diego County since 2005, and we pride ourselves on getting to you quickly when it counts. We maintain all types of systems—furnaces, air conditioners, heat pumps, and ductless mini splits—and we do it right, every time. Let us help your system last longer and run better, season after season. Call now or schedule online to book your HVAC maintenance in San Diego, CA.

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