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.
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!
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.
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.
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!
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.
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.
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.
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!
San Diego, CA 92111