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
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
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.
- 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.
- INSTALLATION
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.
- 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 6/30/25.
- INSTALLATION
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
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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.
San Diego, CA 92111