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.

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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.

$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.

Up to $11,750 Off a New System*

Qualify for HEEHRA and you can get up to $8,000 in HEEHRA rebates, up to $1,150 in manufacturer rebates and up to $2,600 in Federal Tax Credits for a total of up to $11,750 off a new installation. Valid on residential properties only. Cannot combine with any other offers. Must mention promo at time of estimate appointment. Restrictions apply. See dealer for details. Offer valid until funds last.

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 6/30/25.

0% APR for 25 Months

Get 0% APR financing for 25 months on a new heating or air conditioning installation. 0% interest with 25 equal monthly payments. Financing subject to credit approval. 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 6/30/25.

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.

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 Company2. Family Owned3. Great presentation, no pressure4. Good products5. Competitive pricingJust installed yesterday, so jury is still out on the system, but installation was thorough and great communication so far!
Darius Degher
21:45 22 Apr 25
Carson and Michael were brilliant. The heat pump installation went smoothly, and they are really pleasant and trustworthy fellows. The day after it was installed, I had a plumber at my house. He looked at their work and was impressed. He said it was much cleaner than the way HVAC people usually do it.
Lito Ricasata
19:03 08 Apr 25
First time prospective client of Guthrie and Sons. Very responsive staff in providing updates on my calls. Mario F. came over to check out my existing cooling and heating system and is very thorough and professional in providing necessary information related to repair/upgrades. Pending his quote, my experience with Guthrie and Sons is top notch and most highly recommended.Updated review: Kareen, Daniel and Michael worked on the AC replacement, relocation of furnace to the attic and replacement of ductwork. Very professional and knowledgeable team in my opinion. Completed the work in a timely and very satisfactory manner.
Michael Myers
00:19 25 Mar 25
My experience with Guthrie & Sons has been excellent, and I am pleased to write a very favorable review about it. They replaced three air conditioners and three propane furnaces with new equipment that utilizes heat pump technology. I had met with other companies and I was close to coming to a conclusion, when a friend recommended Guthrie & Sons. He told me that they are hyper focused on customer service from beginning to end.Their customer service started with the on line completion of a basic information form. Shortly after submitting that form, I heard from Zach who scheduled an appointment at my home.I had already met with three other HVAC contractors, and for that reason, I had some basic information about the systems available and how heat pumps work and whether propane furnaces should also be installed. I signed a contract on a Friday. By Wednesday of the next week they had completed the installation. Wow.The installation of one of the furnaces in the attic caused minor damage to the drywall. THEY BROUGHT IT TO MY ATTENTION and told me a drywall contractor would be in touch regarding its repair. Two days later it was repaired.Since installation, the equipment (heat pumps from Bosch) has been working great and I am optimistic about the future. Meanwhile, their pricing, warranty and terms are far superior to their competitors.Since this is an unusually long review and so favorable, let me add this: This is my honest, uncompensated opinion. I have no relationship with anyone at Guthrie & Sons other than the contract we executed.
Tom H
15:21 20 Mar 25
We recently had Guthrie and Sons install a Mini-Split system in our home. The entire process was handled professionally with no issues occurring at any time. The estimator (Vlad) went through options with us but let us evaluate the best solution for us with zero pressure. The installation team (Matthew and Aaron) showed up on time, reviewed the scope of the job, made sure they understood what we wanted, and then proceeded to complete the installation exactly as discussed. They asked for my input as needed so there were no surprises when the job was completed.They respected my property and made sure everything was left at least as clean was when they arrived. The job was completed on time and as promised and they reviewed the details of the system and its use clearly. I would definitely have Guthrie and Sons do other electrical/HVAC work should the need arise.
Mike Macias
19:43 19 Mar 25
I have been in the construction industry in San Diego for over 50 years. I owned my own contracting company for over 40 years. I have seen all levels of customer service in my years. The level of customer service from Guthrie and Son’s is among the best I’ve ever seen and received. Every time I hear anyone asking for a referral for HVAC work I immediately give them your number. When I recommend a company I in essence am putting my name and reputation on the line. I refer them with 100% confidence in the service they will receive. Thank you very much for your legendary service.
Scott Sypkens
23:32 11 Mar 25
We first hired Guthrie and Sons to replace a furnace after comparing proposals from several heating and air companies. They’ve since been back for annual check ups, and today Kareen came to diagnose and resolve an issue with our mini-splits. My experience each time, including today, is that they hire friendly, knowledgeable people who do good work. They’ve never tried to upsell or do anything unnecessary, which is the way it should be. I’d recommend them to anyone who asks.
Marilyn Rivas
20:07 09 Mar 25
They always come out quickly. They are so polite and careful.
Steven Wheeler
19:28 07 Mar 25
Good technician did everything right yet our heater still not workingJonathan gave us the likeliest problems so we’ll have to get it fixed
Dmitriy
04:01 07 Mar 25
My AC was not working for seven months. Three other companies tried to fix it with no success. Don’t make the same mistake I did—go straight to Guthrie & Sons! They are absolutely worth every penny.
Cecilia Benevich
22:17 05 Mar 25
Rick
21:38 05 Mar 25
Experienced technician gave me the particulars of a replacement HVAC system
Daylan Dauchot
21:28 05 Mar 25
Courteous, in-time, helpful, honest. Would recommend.
Xinxin Wang
22:05 04 Mar 25
Tom Barden
18:26 04 Mar 25
Adair Cooke
19:02 03 Mar 25
Jonathon is a great technician. He is very willing to answer any questions and explains things very well. He is very transparent with letting us know cost, finance options, different furnace models and anything else we want to know. I would highly recommend him to anyone looking for furnace repair or replacement.

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