San Carlos, San Diego, CA Air Conditioning Services

Stay Cool in San Carlos with Guthrie & Sons

It can get seriously hot here in San Carlos, especially during those late-summer heat waves when the hot air just sits over the neighborhood. Your home should always be the place you can cool off and relax, not another space that feels stuffy and uncomfortable. If your AC isn’t working properly or you’re ready for a new system, call Guthrie & Sons for fast air conditioning services in San Carlos, San Diego—we’ll be at your door ASAP!

Schedule Same-Day Air Conditioner Services in San Carlos with Our Local Air Conditioning Company

Schedule Same-Day Air Conditioner Services in San Carlos with Our Local Air Conditioning Company

When it’s hot in San Carlos, it stays hot. After a full day of sunshine, the house holds onto that warmth and your AC barely gets a break. That’s why it helps to have a local air conditioning company you can count on when things aren’t working right.

Guthrie & Sons Heating, Air & Solar has been serving our San Diego communities since 2005. We’re family-owned and operated, and we’ve built our local business on long-term relationships and honest work. When you call us for air conditioning services in San Carlos, you get experienced technicians, quick response times, and clear pricing, every time. Keeping your home or business cool shouldn’t be a source of stress or worry—let us help. Give us a call or fill out the form to get started!

Learn More About Financing

We Keep Pricing Simple and Straightforward, Just Like It Should Be

We know you’re worried about how much things will cost and are always looking for ways to save. At Guthrie & Sons, we explain all of your options and all of the costs involved right upfront. Installing, repairing, and replacing air conditioners can be an investment for sure, but we have ways to help. We offer:

  • Free in-home estimates so you know the full cost before work begins
  • An easy online quoting tool for new AC installations and more
  • Guidance on available rebates and tax credits
  • Seasonal promotions to help lower upfront costs
  • Helpful financing options with monthly payments


You should always feel confident in the work being done and in the people doing it. Contact us today to schedule your San Carlos AC service.

Get More Life Out of Your Air Conditioner with Our USA Membership Plan

Nobody plans to replace their AC early, and with the right care, you shouldn’t have to! Yearly air conditioning maintenance keeps the coils clean, refrigerant levels balanced, electrical components tight, and airflow moving the way it should. That kind of routine service helps your system cool more efficiently and lowers the chances of a breakdown in the middle of summer.

While you can schedule an AC tune-up with us at any time, we also created the USA Membership Plan to make staying on track easier. Better yet, we’ve given you tons of exclusive opportunities to save time and money! It offers scheduled service for central AC units, heat pumps, and ductless systems. 

We handle the reminders and provide member perks like discounted repairs and priority appointments during the busiest months. This is automatic peace of mind and helpful, convenient care from a team that’s always putting the customer first. Talk to us about signing up and seeing how much you could save!

See Our Maintenance Plans
How Can We Help You Today? Learn More About Our Air Conditioning Services in San Carlos

How Can We Help You Today? Learn More About Our Air Conditioning Services in San Carlos

If you’ve been searching for AC services near me, Guthrie & Sons is local and ready to help. We’re a San Diego-based AC company serving homes throughout San Carlos, including the foothills and the Dailard area. Whether you’re on Lake Ashmere or along Jackson Drive, we can get to you quickly and get to work. Learn more about our air conditioning services in San Carlos, San Diego, below.

When you need a new air conditioner installed or your current system repaired, serviced, or replaced, Guthrie & Sons provides the air conditioning services San Carlos depends on. Many homes here rely on central AC systems to stay comfortable during long stretches of heat. We work with all makes and models, whether your system is newer or well past the 10-year mark.

Our air conditioning installation in San Carlos starts with making sure the system is the right size for your home. Too big or too small can cause constant cycling and uneven cooling. We set it up correctly so it cools evenly and doesn’t work harder than it has to.

Most AC systems lose efficiency slowly when they’re not maintained. With our air conditioning maintenance in San Carlos, we clean coils, inspect fan motors, test safety controls, and make sure the system cycles on and off correctly. That helps prevent strain and keeps cooling consistent.

Strange noises, short cycling, or weak airflow are signs something inside the system isn’t right. Our air conditioning repair in San Carlos includes checking motors, control boards, refrigerant charge, and duct airflow. We make sure everything is working together like a well-oiled machine.

Air conditioning replacement in San Carlos becomes necessary when major components like the compressor or evaporator coil begin failing. At that point, repair costs probably aren’t worth it. We help you choose equipment that fits your home’s cooling needs and install it correctly from the start.

Ductless Mini Split Services

Ductless Mini Split Services

Ductless mini splits can be installed throughout an entire home or just in the rooms that need extra cooling. We see them in upstairs rooms, converted garages, sunrooms, and home additions, too. At Guthrie & Sons, our ductless mini split services in San Carlos cover new installations, maintenance, and system upgrades.

Our ductless mini split installation in San Carlos includes installing the outdoor condenser, indoor air handlers, dedicated electrical connections, and proper drainage. One mini split air conditioner can cool a single space, or a multi-zone setup can handle several rooms with individual controls.

Over time, buildup inside the unit can slow things down. During your ductless mini split maintenance in San Carlos, we clean, inspect, and test the system so it keeps up when temperatures rise. Regular service helps avoid surprise issues.

When your mini split struggles to cool or runs constantly, it may be nearing the end of its life. A ductless mini split replacement in San Carlos gives you a fresh start with updated equipment. We help you choose a system that fits the space and install it properly.

Heat Pump Services

Heat Pump Services

Heat pumps cool your home in summer and heat it in winter using the same system. During hot San Carlos afternoons, they work just like an air conditioner by pulling heat out of your house. We provide full heat pump services in San Carlos, including installation, maintenance, repair, and replacement.

A heat pump installation in San Carlos is becoming more and more common because of how efficient these systems are. A heat pump transfers heat instead of generating it, which means it uses way less electricity to cool your home. During the install, we’ll set up the outdoor condenser, indoor air handler, refrigerant lines, and thermostat controls, making sure everything is properly sized, connected, and tested before we leave.

Heat pumps work almost all year, which means parts wear down faster without regular care. Our heat pump maintenance in San Carlos includes cleaning coils, checking refrigerant levels, inspecting electrical connections, and confirming the system switches modes properly. 

Strange noises, short cycling, or a thermostat that doesn’t seem to match how the house feels are all warning signs. Our heat pump repair in San Carlos means we test the system from top to bottom and fix what’s failing. That way you’re not calling us again for the same issue next month.

Heat pumps typically last 12–15 years before performance starts slipping. If your system runs constantly, your energy bills are climbing, or a major part like the compressor fails, that’s when we start talking about heat pump replacement in San Carlos. We’ll walk you through the numbers and let you know honestly when it’s smarter to replace than fix.

HVAC System Services

HVAC System Services

Heating and cooling equipment is one of the biggest systems in your home. We treat it that way. At Guthrie & Sons, our HVAC services in San Carlos focus on protecting your investment, improving efficiency, and making sure your setup fits how you actually use your space. You’ll get great equipment (and great service!) at great prices.

We handle HVAC installation in San Carlos for new builds, full renovations, and retrofits in older homes. Whether you need a central furnace and AC combo, a two-in-one heat pump, or ductless mini splits throughout the house, we work with all kinds of equipment on all kinds of properties. Your HVAC installation in San Carlos will fit both your home and your budget.

Most of the HVAC repairs we see come down to skipped maintenance. Small issues build up over time until something finally gives out. We recommend heating maintenance in the fall and cooling maintenance in the spring so your system is ready before heavy use. During your visit, we inspect your HVAC system and all of its components to keep everything in good shape. Regular HVAC maintenance in San Carlos helps your equipment run stronger and last longer.

If your AC can’t keep up or your heater isn’t warming the house evenly, it’s time to take a closer look. We provide heating repair and cooling repair services, with emergency repairs available when you need them most. With our fast HVAC repair in San Carlos, you can get back to normal as quickly as possible.

When you’re facing HVAC replacement in San Carlos, the last thing you want is a complicated process. Too often, people deal with inflated quotes, vague answers, and long wait times. That’s not how we operate. We give you clear pricing, straightforward options, and move quickly so you’re not stuck without heating or cooling.

As a Daikin Pro Elite Contractor, we’re able to offer HVAC system monitoring for compatible Daikin systems. These connected units send performance updates that let us see how the system is operating behind the scenes. If something starts trending in the wrong direction—like abnormal run times or system alerts—we can catch it fast. That early insight helps prevent larger repairs and keeps your heating and cooling running with fewer surprises.

The Air Conditioning Company San Carlos Has Counted On Since 2005

The Air Conditioning Company San Carlos Has Counted On Since 2005

Whether you’ve just moved to San Carlos or you’ve called this neighborhood home for years, Guthrie & Sons is here when you need reliable AC service. Wes Guthrie founded this company in 2005 with a commitment to honest pricing and quality workmanship. Today, that same family-driven approach continues, with a focus on doing right by every customer. 

Here’s more about our San Carlos, San Diego, air conditioning service:

  • 100% Customer Satisfaction Guarantee: If something isn’t right, we will make it right.
  • Upfront, Honest Pricing: You receive detailed estimates with no hidden fees.
  • Expert Technicians: We service and install all major AC makes and models.
  • Family-Owned: We’re one of the last family-run HVAC companies in the area.
  • Lifetime Workmanship Guarantee: Our installations are done carefully and built to last.
  • 2-Year Labor Warranty: Every new install includes two years of labor coverage.
  • Free Quotes on New Systems: We provide clear quotes before any commitment.
  • Convenient Financing Options: Payment plans are available to fit your budget.
  • Property Protection Guarantee: We protect your space and clean up when we’re done.

For the air conditioning services San Carlos, CA, recommends most, contact Guthrie & Sons today.

Frequently Asked Questions

It depends on how much space you’re cooling. A single window unit can be affordable for one room, but once you start running two or three, energy use adds up quickly. Central air is much more efficient for cooling an entire home and does a better job keeping temperatures consistent from room to room.

On a typical summer day in San Carlos, your AC may run anywhere from 8 to 12 total hours, cycling on and off to maintain the set temperature. During heat waves, it’s not unusual for it to run 12 to 16 hours, particularly in the late afternoon and early evening. If it runs nonstop without reaching your thermostat setting, or shuts off quickly and turns back on repeatedly, that’s usually a sign something needs attention.

In San Diego, many homeowners are on time-of-use electric plans, where rates increase in the late afternoon and early evening, often between 4 p.m. and 9 p.m. That’s also when outdoor heat lingers and your system works hardest. Pre-cooling your home earlier in the day in San Carlos can help reduce those peak-hour energy charges.

If your AC is blowing air that feels barely cool during a hot day, or you notice ice forming on the refrigerant line outside, it may be low on refrigerant. Since refrigerant doesn’t get “used up,” low levels usually mean there’s a leak. A technician can test the system, repair the leak, and recharge it properly.

In San Carlos, if it’s 95°F outside, most systems are realistically designed to cool your home to around 75–78°F. Expecting it to reach the upper 60s during extreme heat can overwork the system. Keeping that 15–20 degree difference in mind helps protect your equipment and avoid unnecessary strain.

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.

Rocky profile picture
Rocky
23:03 09 Mar 26
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 profile picture
Troy Nabatilan
00:21 15 Feb 26
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 profile picture
Johnathan Yang
18:56 07 Feb 26
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 profile picture
Sunyim Kim
18:45 06 Feb 26
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.
saul profile picture
saul
18:45 06 Feb 26
Guithre and Sons distinguish themselves not only through their high level of professionalism but also by their unwavering commitment to the quality and durability of every product they sell and the meticulous craftsmanship involved in each project. The company operates with a strong dedication to integrity and respect, fostering long-term relationships with clients and suppliers alike. They prioritize transparency and ethical standards in all business dealings, ensuring customer satisfaction and trust at every interaction. Their customer service team is exceptionally responsive and knowledgeable, consistently exceeding expectations to resolve issues swiftly and effectively.
Ariana Lujan profile picture
Ariana Lujan
17:43 20 Jan 26
Very helpful, quick and easy to schedule! We had an unexpected (but necessary) repair when doing maintenance and both the office and tech Carson were thorough and transparent in their support. Great service!
Graham Davis profile picture
Graham Davis
15:37 18 Jan 26
After dealing with several HVAC companies, Guthrie & Sons clearly stood out as the most ethical, honest, and reliable. From the very beginning, their approach felt transparent and genuinely focused on what was best for us—not on upselling or unnecessary replacements.

We worked with Vlad T., who had previously been out to our home and saved us tens of thousands of dollars by getting our existing AC unit up and running when other companies were pushing for a full replacement. That experience alone earned our trust.

Now that we’re finally ready to purchase new units, there was no question that Guthrie & Sons was the only company we would consider, and Vlad was the obvious choice. He was extremely professional, punctual, and exceptionally knowledgeable, taking the time to explain options clearly and thoroughly. His expertise and honesty made the entire process straightforward and stress-free.

If you’re looking for an HVAC company you can truly trust—one that values integrity, quality workmanship, and customer service—I cannot recommend Guthrie & Sons and Vlad T. highly enough. This is how service should be done.
Blas Falconer profile picture
Blas Falconer
19:35 17 Jan 26
The layout of my condo made installing splits challenging, and before I met with Guthrie and Sons, three companies either told me that it couldn't be done. Vlad studied my apartment until he found a way to install with minimal openings in the walls and without a second condenser. Mallory, who works in the office, always followed through and advised me when I ran into a hiccup and needed detailed plans for the city. My HOA appreciated Guthrie and Sons' thoroughness and was so impressed with the design, that another resident who had been wanting splits for years, decided to install splits at the same time. The team that came in was knowledgeable, professional, and hard working. They finished a day ahead of time. I'm thrilled with the way everything looks and works.
Rob profile picture
Rob
18:12 12 Jan 26
This is by far the best company for your HVAC needs. They are honest very caring. Good fair pricing and got the job done efficiently and on time. I also signed up for their bi-yearly service which they performed the winter one and went very well. Thanks
Tania Reyes profile picture
Tania Reyes
23:47 05 Dec 25
I’ve been using Guthrie & Sons for over 15 years. They installed my whole AC system and maintained it all those years and never had an issue. Well it was time for an upgrade and they’ve recently installed my second system. The team 15 years ago and the team this time around were both amazing, professional and clean. I can’t recommend them enough Matt, Ben, Christian and Bryan get 10 stars. They are a bit pricier but worth the investment when you have peace of mind and almost two decades of great service and no issues.
Trejos Marcela profile picture
Trejos Marcela
17:27 04 Dec 25
I had an excellent experience with Guthrie & Son AC & Heater Company. Their customer service was outstanding, and they took the time to answer all my questions thoroughly. Every technician who has worked on my AC/heater installation and now the ongoing service has been knowledgeable, respectful, and always on time. I highly recommend them to anyone in need of HVAC services!
I only wish the annual service was cheaper 🙂
Paula Remmel profile picture
Paula Remmel
06:34 02 Dec 25
I have a maintenance plan for my heat pump and air conditioner which Guthrie & Sons installed two years ago. I am very happy with my system as well as the maintenance plan. Wayne, one of their excellent technicians, just completed the Fall service and now the system is ready for winter use. He is knowledgeable and has been able to answer any questions I have about my system. In addition, the office at Guthrie & Sons is very responsive and follows through on any questions and concerns within 24 hours if not immediately. Great service from a great company.
Bill Cogan profile picture
Bill Cogan
22:04 24 Nov 25
Guthrie & Sons responded immediately to my online request, and was able to send someone out immediately. Zack, our technic-ian was very friendly, professional, knowledgeable and gladly answered all of our questions. He found the problem immediately, and left the work area clean and in good order. We would highly recommend Guthrie & Zack! They are real assets to our community.
Dani P profile picture
Dani P
03:27 16 Nov 25
I've been using Guthrie & Sons for over 10 years and two homes. I really like that they are a family-owned and an established business. Always professional, on time, and always quality work. I've used their services from simple routine maintenance to having a new AC installed.I've never had a bad or even mediocre experience; I'm just always overall pleased with their work.
David Downhour profile picture
David Downhour
02:47 10 Nov 25
We bought our HVAC system from Guthrie & Sons. They have been monitoring our system online and later noticed a heat sensor issue.

Zach M. came by and installed on new one. He was extremely professional and completed the installation promptly.

This was another great experience all around and I gladly recommend Guthrie and Son's for all your HVAC needs.
Rachel Phillips profile picture
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 profile picture
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 profile picture
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 profile picture
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 profile picture
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.

Make an Appointment with Guthrie & Sons in San Carlos

San Carlos is a beautiful community filled with great people. Guthrie & Sons Heating, Air & Solar provides residential and light commercial air conditioning services in San Carlos, San Diego, so if you’re looking for a dependable local HVAC contractor, you’re in the right place!

 

We love spots like Lake Murray Community Park, the San Carlos Community Garden, and the San Carlos Recreation Center, and we know you do too. This is a neighborhood where people care about their homes and their community. We work hard to earn your trust and keep your space comfortable. For the air conditioning services San Carlos has relied on for years, contact Guthrie & Sons.

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