Air Conditioning Maintenance

Air Conditioning Maintenance in San Diego County for a System That Works Better and Costs Less

Noticing warm air, weak airflow, or odd noises coming from your AC? At Guthrie & Sons, our 26-point air conditioning maintenance catches problems early and keeps your system in great shape. Whether it’s your home, rental, or business, we’ll get your AC clean, efficient, and ready for even the hottest weather.

Stay Cool, Save Money, and Keep Your AC Going Strong

It’s easy to skip air conditioning maintenance. When your system seems to be working fine, it’s not exactly top of mind. You’re busy, the house feels cool enough, and there’s always something more urgent to take care of. But here’s what we see all the time: clogged filters that choke off airflow, refrigerant leaks that go unnoticed, and dirty coils that force your system to work twice as hard just to keep up. That wear and tear builds up until suddenly your AC isn’t cooling, your energy bill jumps, or something breaks completely—usually on the hottest day of the year.

Every AC system needs maintenance, whether it’s brand new or has been hanging in there for 10+ years. That includes central air, heat pumps, and ductless mini splits. At Guthrie & Sons Heating, Air & Solar, we handle it all—residential and commercial, systems we installed and systems we didn’t. Don’t wait for something to go wrong—contact us for air conditioning maintenance in San Diego, CA, today and keep your cool all year long.

What is an AC Tune Up Anyway?

An AC tune up is a full check-up for your air conditioning system. Our HVAC technicians clean components, test key functions, check refrigerant levels, inspect electrical connections, and make sure everything’s running safely and efficiently.

Obvious benefits? You’ll stay more comfortable and save on energy bills and air conditioning repair services. Lesser-known ones? You’ll keep your warranty valid and extend the life of your AC unit. Whether your system’s brand new, older, or somewhere in between, an AC tune up with us is one of the best ways to protect your investment and avoid those sweaty, mid-summer surprises.

Upfront Pricing

How much is an A/C tune-up? $129, and you can see every option here.

Pick air conditioner and tune-up in our Price Finder to compare the one-time $129 tune-up with the USA Membership rate of $99, then book the time that works for you.

$95 diagnostic service call
$129 furnace or A/C tune-up
$81 service call for USA Members
Free estimates on new systems

Price Finder

Pick your equipment, pick the job, see the price.

See My Price Now

Two clicks, no phone call, nothing to fill out. Or call (619) 202-1744.

How Often is AC Maintenance Required?

In San Diego, we recommend scheduling air conditioning maintenance services at least once a year, ideally in the spring, before the summer heat hits. That gives us time to catch any air conditioner repair issues and get your system ready for heavy use. If you have a heat pump that also heats your home, it’s smart to schedule a second checkup in the fall.

Common Signs You Need Air Conditioning Maintenance

If your air conditioning unit isn’t keeping up like it used to, these are some of the most common signs it’s time for a tune up:

Warm air coming from your air vents instead of cool air
Weak airflow or inconsistent temperatures
Higher energy bills without explanation
Strange noises or musty smells
AC system is running longer than it used to

If you’re noticing any of these—or it’s just been a while since your last AC maintenance service (or you’ve never had one)—now’s the time. Call or schedule online today and let us help get your AC system back on track. Don’t forget to check out our special offers for extra savings!

INSTALLATION

Up to $1,000 Off a New System

Receive up to $1,000 in manufacturer rebates on select systems. Not valid on “Worry Free System”. Must mention promotion at time of estimate appointment. Not valid on prior sales. Cannot be combined with any other offers. Restrictions apply. See dealer for details. Offer expires 10/31/2026.

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. Not valid on “Worry Free System”. 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 10/31/2026.

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 10/31/2026.

WATER HEATER

Free Estimate on a New Heat Pump Water Heater Installation

Valid for an estimate for a new hybrid heat pump water heater installation or replacement.

Restrictions apply. See dealer for details. Offer expires 10/31/2026.

Experience the Full Power of Our 26-Point AC Maintenance Checklist

But what sort of regular maintenance does an air conditioner really need? For some AC companies, it’s a quick glance, a bill, and they’re on their way. At Guthrie & Sons, we take it much further—because real air conditioning maintenance should actually improve your system.

We go deep with a 26-point checklist that covers every part of your AC, from airflow and wiring to refrigerant and performance. It’s not about doing the bare minimum—it’s about making sure your system runs better, lasts longer, and keeps you comfortable all season.

Clean Outdoor Unit: We remove debris, dirt, leaves, and more from the condenser coils.
Clean Outdoor Coils: We rinse the coil for better airflow and energy efficiency.
Inspect and Clean Air Cleaner: If your system has one, we clean all components.
Clean or Replace Standard Filter: We’ll clean washable filters or replace disposables. (You supply it, or we can.)
Inspect or Replace UV Bulbs: If you use UV purification, we’ll inspect or swap bulbs. (Bulbs can be supplied or purchased.)

Check and Test Drain Lines: We check for clogs that could lead to leaks or water damage.
Check and Test Condensate Pumps: We make sure pumps are operating safely.
Check and Test Condensate Switches: We verify that the safety switches are working to prevent overflow.

Visual Inspection of Indoor Coil: We check for dirt and corrosion.
Visual Inspection of Ductwork: We make sure it can maintain proper airflow.
Check Line Set Condition: We inspect refrigerant lines for wear, damage, or kinks.

Check Thermostat Operation: We make sure your thermostat is responding and reading accurately.
Inspect and Tighten Electrical Connections: Loose wires cause trouble—we make sure everything is secure.

Inspect Outdoor Fan Blades: We look for cracks or damage.
Test Amps of Outdoor Fan Motor and Compressor: We test for proper performance and early failure signs.

Check Refrigerant Charge and Type: We confirm refrigerant levels are accurate and match your system requirements.
Check Suction and Discharge Pressure: We verify that pressures are within safe, efficient operating ranges.
Check Superheat and Subcool Readings: We take advanced readings to fine-tune refrigerant performance.
Check Outdoor Ambient Temperature: We record outside temps to compare system performance under current conditions.
Check Return Air Wet-Bulb and Dry-Bulb Temperatures: We measure humidity and temperature of return air to assess cooling efficiency.
Check Supply Air Dry-Bulb Temperature: We confirm the cooled air leaving your vents is at the correct temperature.

If you did the math, that’s 26 detailed steps—because your system deserves that level of care. After your air conditioning maintenance, we’ll walk you through what we found. If everything looks good, we’ll show you how to keep it running strong for the season ahead. If we spot something that needs attention, like low refrigerant, a worn part, or signs your system is slowing down, we’ll explain your options clearly, whether that’s a simple AC repair or planning for a future air conditioning replacement. You’ll get a full report for your records (and warranty), and a clear path forward.

Keep Your AC in Top Shape With a Maintenance Plan That Pays Off

Staying on top of air conditioning maintenance shouldn’t feel like a chore, and with our USA Membership Plan, it doesn’t! We’ll remind you when it’s time for service, handle the scheduling, and show up ready to take care of everything from filter changes to system checks. Members enjoy real perks like priority scheduling, discounted service calls, 15% off all repairs, and an upgraded 5-year warranty.

Whether you have a central HVAC system or a ductless mini split, we have a plan that fits your heating and cooling setup and keeps your comfort on track. Call our office or talk to your technician about signing up!

Frequently Asked Questions

Yes, even if your system seems fine, skipping yearly HVAC service is one of the top reasons we get called for AC repair. Over time, wear and tear builds up, and catching small issues early can save you from bigger, costlier problems later. Annual maintenance also keeps your system working efficiently, especially in San Diego’s long cooling season.

We recommend filter replacement every 1–3 months, depending on your home and lifestyle.
Dirty air filters restrict airflow, raise your energy bills, and make your AC work harder. It’s a common reason for many air conditioner repair calls. Changing your filter regularly is one of the easiest ways to improve performance and avoid HVAC issues.

Yes—homes with pets often need more frequent AC service. Pet hair and dander clog filters faster, reduce airflow, and can lead to dirty air filters that affect system performance. We’ll help keep your HVAC system clean and efficient with the right service plan.

Pricing on our air conditioning services in San Diego depends on your system and setup, but we keep it fair and transparent. We offer one-time tune-ups or ongoing HVAC service through our USA Membership Plan, which includes perks like discounted repairs and priority service.

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.

L A-G

4 weeks ago

Vlad T at Guthrie & Sons gave me a lot of information and recommendations for air conditioning for our house. He was professional and knowledgeable and gave me pros and cons for all of the options. I highly recommend working with him.

Valerie Williams-McGuire

1 month ago

My husband and I were so concerned about our Air Conditioner needing repair. First, an extreme heat wave is expected this week, and we couldn’t afford a huge AC repair bill. When I opened my front door, I was greeted by a kind smile. Zach listened to me explain the issue, asked a few questions, and promptly tested the unit. He was professional and honest. Zach explained that we needed a new capacitor, and assured us that everything else looked good. He showed me the old part and patiently suggested options that I had on ways to replace the part, and where I could purchase it, should I choose to do so. Zach also didn’t try to pressure us into buying something that we really didn’t need, like a total replacement. I have dealt with high pressure scammers before. Zach is different. He really cares. I will definitely be sharing this business with any of my family and friends who need assistance with their air conditioning, and we will call Zach if we ever need help again. Thanks again Zach!

Nancy Beattie

1 month ago

Guthrie & Sons installed, and all electric heat pump system for myAC And heating needs. Vlad Thoroughly surveyed my home and needs, answered my many questions, and designed the system as well as additional options. Installation was scheduled in just a few days, and Christian, Michael, and.Andriy showed up on time and completed the installation in just one day. The small space and limited access where my old furnace had been became an issue, but Michael presented a creative solution that worked. I couldn’t be happier and would not hesitate to recommend Guthrie.&Sons.

Minh N

2 months ago

I had my HVAC system replaced by Guthrie & Sons and was impressed throughout the entire process. The crew showed up right on schedule, laid down drop cloths, draped the work area with plastic, and handled the removal and installation with care. Everything was completed in one day, exactly as promised. A minor issue came up after the install, and they responded right away and fixed it without any hassle. Professional, reliable, and easy to work with. Highly recommend.

Dan Davidson

2 months ago

Our Technician Zach was extremely Knowledgeable and professional when it came to our HVAC system. He also has great communication skills when describing any issues with our system. I would highly recommend Guthrie & Sons Heating, Air, and Solar.

John Wood

2 months ago

Every part of this experience shows the value of working with well-organized and personable firms. From the moment I contacted Guthrie & Sons, every part of the experience has been first-rate. I had one cheaper quote, but the professionalism of this team convinced me that with an investment like this, it was worth it to work with THE A TEAM. Highly recommend!

Christiana Hellinga

3 months ago

Easy company to work with and quick scheduling from initial consultation to work completed. Mario came out for the initial consultation and James & Andriy completed the work of replacing our ducts. All three were professional, kind, and informative. I was surprised they were able to take out our duct work and replace it all in one day and I super appreciate that they crawled around in our short attic in this summer heat. They will be my recommendation for hvac needs.

Rex Roe

4 months ago

Guthrie and sons are our Go To for all things AC! Easy to schedule service and very friendly staff. Mario came out today and quickly determined our issue and got us back on track. Thanks so much!

jacqulinet1

4 months ago

I am very pleased with the service I received for replacing my furnace in my second story condo. This company really tries to please their customers, which is rare these days. Matthew and James were pleasant, knowledgeable and patient with my questions. The office was great about staying in touch regarding date and time to expect the technicians and providing the number to call for questions. I sam so happy I chose this company to do the job.

Keith Mar

4 months ago

I was told by a couple other companies that I needed to replace my system. Vlad came out and made sure that my old system actually needed to be replaced and found it could be fixed for a fraction of the price. I appreciate the honesty and would definitely recommend. Edit the technician came out and made the repairs. He did a good job of explaining the situation and giving a couple options.

Darrell Brookstein

5 months ago

Have dealt with Guthrie & Sons regularly for more than 12 years. They are super good in every way re: heating and A/C. Special shout-out to their service man, Mario F, who checked out our systems yesterday. He was extraordinary and really helped us on several issues we noted, and a couple of issues he brought to our attention. Kudos!

Jim Hainline

5 months ago

We had Rob from Guthrie & Sons come out to repair one of our A/C units. Rob was very friendly and professional. Rob resolved the problem quickly. As far as price goes, I paid a higher flat fee 12 years ago from one of the larger local companies. I'm very impressed with pricing and quality of work. I highly recommend Guthrie & Sons and Rob.

Amy Graeber

5 months ago

Great experience! The company confirmed my appointment and let me know who my technician was via text. They also updated me when he was on his way. The technician was friendly and knowledgeable. I’d recommend Guthrie & Sons to friends and family.

Bobby Orozco

7 months ago

Great experience working with Guthrie & Sons from start to finish. Vlad was awesome. He was incredibly knowledgeable and explained everything in detail. Stark contrast from other companies we received bids for. Christian and his crew did a great job on the install everything was smooth from start to finish. I would definitely recommend this company here in Murrieta.

Sharon Troeger

7 months ago

Guthrie & Sons has always been super professional and knowledgeable about our system. They did the install a few years ago and have continued to maintain it for us. This year we noticed that our system wasn't performing as well, so when Wayne came out, he noticed a likely leak and was back 2 days later to find and fix it. He was quick, professional, and just extremely nice! 100% recommend.

Jeff Haight

8 months ago

Called one of the "big guys" in town and the estimate to do what needed to be done to diagnose my problem was nearly 1/2 the cost of the system when I purchased it and had it installed 5.5 years ago, I found Guthrie & Sons and they came out the same day and did the same work for 1/4 the price I was quoted for the same exact work! Daniel was friendly, honest and quickly got my system working as expected. I even purchased the service plan so I don't have future problems. I highly recommend these guys, they were awesome, don't get ripped off call Guthrie & Sons!!!

Rocky

8 months ago

I highly recommend Guthrie & Sons; from setting the appointment to the actual service!! Daniel was prompt, able to take care of our issue at a very reasonable price. I will be using them for all our needs in the future!!!! Thanks Daniel and Mackenzie.....you were great!!

Troy Nabatilan

9 months ago

Matt and Bryan are truly the A-Team! Their teamwork was outstanding and the workmanship was meticulous. The air handler was carefully installed, wiring neatly secured, plenum perfectly fitted, and the condenser precisely positioned and leveled for proper clearance and vibration control. The line set was pressure-tested and vacuumed as well. They also left the work area clean and neat. Please congratulate them for a job well done!

Johnathan Yang

9 months ago

Guthrie and Sons was very professional and communicative. Matthew and Bryan did incredible work, and followed up with a lot of testing to make sure my new unit was functioning well. They went above and beyond to ensure that things were done correctly. I could tell their standards were extremely high, and I felt relieved seeing how much care they took in their installation. I’m very pleased with the result!

Sunyim Kim

9 months ago

I called to estimate to install central air conditioner on our second floor condo. Manager came the next day very punctual and knowledgeable about the process. He listened carefully our concerns and let us to make a decision. We truly appreciate his professionalism. Thank you for your service and I would recommend anyone who needs heating and air conditioning services in San Diego.

Schedule Your San Diego Air Conditioning Maintenance With Guthrie & Sons

Every summer, we get called in for emergency AC repairs that could’ve been prevented with a little routine maintenance. If you want to avoid major problems and costly repairs, we’re here to help. Guthrie & Sons Heating, Air & Solar provides expert air conditioning maintenance in San Diego, California, plus reliable service to surrounding cities. From tune-ups to full AC service plans, our HVAC company offers what your cooling system needs to last. Schedule service today!

8248 Ronson Road
San Diego, CA 92111

(619) 269-3013

Air Conditioning Maintenance