Solar and HVAC Services in Carlsbad, CA

From Hot Summers to High Utility Bills, We Help You Beat the Heat and Cut the Costs

When it comes to keeping your home comfortable in sunny Carlsbad, California, Guthrie & Sons Heating, Air & Solar has you covered. Our skilled team has the experience and knowledge to address any HVAC issue with ease.

With us, you can count on a cozy home when the evenings turn cool and a refreshing escape during hot, sunny days. Plus, our solar solutions help you make the most of Carlsbad’s sunshine for greater energy savings. Schedule an appointment or request an estimate today!

Trusted Heating, Cooling, Indoor Air Quality, and Solar Solutions in Carlsbad, CA

At Guthrie & Sons, we specialize in keeping homes and businesses in Carlsbad comfortable—no matter the season. Whether you're looking to beat the summer heat or stay cozy when the evenings turn cool, our team delivers trusted HVAC solutions designed to match your lifestyle, your home, and your budget.

We’re a family-owned company with deep local roots and a reputation for honest service, top-quality work, and no upsells—ever. We don’t have time for that and know you don’t, either. Our experienced technicians are here to help with everything from air conditioner installation and heating repair to indoor air quality upgrades and energy-efficient heat pump systems.

We also offer solar energy and heat pump water heaters to help Carlsbad home and business owners take full advantage of the California sunshine and lower their utility bills long term.

When it comes to climate control, Guthrie & Sons brings the experience, professionalism, and personal care you deserve. Contact us today for HVAC services in Carlsbad, CA!

The Guthrie Way

Service Backed by Integrity, Experience, and Family Values

Choose Guthrie & Sons for your heating, cooling, and solar needs, and enjoy the benefits of a family-owned, NATE-certified company. We provide upfront pricing, free estimates, and special offers to fit your budget.

5-Star Service

We show up when we say we will, get the job done right the first time, and leave your home better than we found it. Every customer matters—and we treat you like family.

Honest Pricing

You’ll never be surprised by hidden fees or confusing estimates. We explain everything clearly, walk you through your options, and provide transparent, reasonable pricing for the work.

Skilled Technicians

When it comes to your home’s comfort, training and experience make all the difference. That’s why our technicians are NATE-certified—the highest level of certification in the HVAC industry.

Family-Owned

We’re not just a company—we’re a local family business built on trust, reliability, and doing right by our community. When you choose Guthrie & Sons, you’re choosing people who care.

No Upsells

Our job is to help you make smart decisions—not to talk you into something you don’t need. If a simple repair will do the trick, that’s what we’ll do.

Keep Your HVAC System Running Strong With Our USA Membership Plan

A well-maintained HVAC system is safer, more efficient, and less likely to leave you scrambling for last-minute repairs. With the Guthrie & Sons USA Membership Plan, you’ll get:

Scheduled maintenance reminders so you never miss a tune-up
Priority scheduling when something goes wrong
Discounts on repairs and reduced service call fees

Our maintenance plan is designed to protect your comfort and your wallet—because proactive care is always better than reactive fixes. Read more about our plan and reach out to sign up!

Maintenance Plans

Flexible Financing for Your Heating, Cooling, and Solar Needs

When unexpected repairs or replacements catch you off guard, we’re here to help. Guthrie & Sons offers flexible financing options to make installing new systems or major repairs more manageable. Whether it’s a new high-efficiency HVAC system, a heat pump installation, or solar upgrades, we’ll help you explore affordable monthly payment options that work with your budget.

Learn More About Financing

Heating and Cooling Services in Carlsbad, CA

Your home should feel comfortable in every season—and that starts with a well-functioning HVAC system. At Guthrie & Sons, we provide a full range of heating and cooling services in Carlsbad designed to keep your indoor climate just right all year long.

From new system installations to emergency AC repair, we bring expert care, professional HVAC insight, and personalized service to every job. Explore our full list of services below or reach out to book your appointment—we’re here to help.

Air Conditioning Services

Living in Carlsbad means enjoying warm, sunny days most of the year, but that also means your cooling system needs to work efficiently to keep up. We offer air conditioning services in Carlsbad, CA, that improve air flow, lower utility bills, and create a more energy-efficient home.

Whether you’re installing a new unit, replacing an outdated system, or keeping up with routine AC maintenance, our licensed technicians have the experience to get it done right.

Air Conditioning Installation

We provide custom air conditioner installations for homes of all sizes—whether you’re upgrading an older system or outfitting a newly built property. Our team will size your unit accurately, install your ductwork if needed, and ensure your system is optimized for performance and SEER-rated energy efficiency.

Air Conditioning Maintenance

Preventative AC maintenance keeps your system running smoother, longer. Our air conditioning tune-ups include cleaning coils, checking refrigerant levels, inspecting electrical components, and clearing your condensate drain line to protect performance and extend system life.

Air Conditioning Repair

Noticing weak air flow or warm air coming from your vents? If your cooling system isn’t doing its job, we provide fast, honest air conditioning repair services in Carlsbad. We use professional tools and years of hands-on experience to diagnose and fix the issue—usually in just one visit.

Air Conditioning Replacement

If your air conditioner is more than 10–12 years old, struggles to cool your space, or needs frequent repairs, it may be time for an air conditioning replacement. We’ll help you choose a new, energy-efficient cooling unit that fits your home and budget.

Mini Split Services

Looking for a better way to cool and heat individual rooms in your home? Our ductless mini split services in Carlsbad offer a flexible, energy-efficient solution for spaces where traditional HVAC systems fall short.

At Guthrie & Sons, we specialize in the installation, repair, maintenance, and replacement of ductless mini split systems that keep your home comfortable while helping you save on utility bills.

Mini Split Installation

We install ductless mini splits in garages, sunrooms, home offices, guest suites, older homes, and anywhere ducts don’t reach. These energy-efficient systems offer zoned heating and cooling with no major construction required. Many installations qualify for rebates or tax incentives—ask us how to save.

Mini Split Maintenance

Routine maintenance keeps your ductless mini split running efficiently and helps prevent costly breakdowns. We clean filters, check the heat exchange, inspect electrical components, and ensure smooth air flow. Regular mini split tune-ups protect performance and extend the life of your system.

Mini Split Repair

If your ductless mini split isn’t heating or cooling like it should, we’re ready to help. Whether it’s poor temperature control, error codes, or strange noises, our technicians quickly diagnose and repair the issue. We perform mini split repairs on all major brands and restore comfort fast.

Mini Split Replacement

When repairs no longer cut it or your unit is driving up utility bills, a mini split replacement may be the best solution. We’ll evaluate your current system and recommend a high-efficiency upgrade tailored to your home. Enjoy better comfort, lower costs, and reliable indoor climate control.

Heat Pump Services

A smart solution for year-round comfort, heat pumps offer both heating and cooling in one sleek, energy-efficient system. In Carlsbad’s mild climate, they’re a perfect fit—pulling warmth in during cooler months and pushing it out when things heat up.

Guthrie & Sons has all of the heat pump services in Carlsbad that you need, from installation to repair and replacement, to keep your home comfortable throughout the year.

Heat Pump Installation

Installing a heat pump is one of the most efficient ways to heat and cool your home—and our team makes the process easy. We assess your home's layout, insulation, and air flow needs to design a system that balances temperature control and energy use.

Heat Pump Maintenance

Heat pumps work twice as hard as single-purpose systems—running year-round to keep your indoor climate just right. That’s why regular heat pump maintenance is so important. Our technicians follow a detailed checklist to tune up your heat pump system and help it last longer.

Heat Pump Repair

Even the most reliable systems can run into trouble. If your heat pump is blowing cold air in winter, won’t cool your space evenly, or cycles constantly, it may be time for a heat pump repair. We handle everything from electrical issues and faulty sensors to compressor problems and refrigerant leaks.

Heat Pump Replacement

When your current system is aging, underperforming, or needs frequent repairs, a full heat pump replacement might be the smarter long-term move. We’ll help you select a high-efficiency system so you get better comfort with less energy waste. Our installation process is quick, clean, and backed by strong warranties.

HVAC Services

Your home’s comfort isn’t just about one piece of equipment—it depends on how your air conditioner, heater, thermostat, and other systems work together. At Guthrie & Sons, we offer HVAC services in Carlsbad to make sure everything runs efficiently and reliably.

From improving air flow to fine-tuning temperature control, we keep your home’s heating and cooling systems working the way they should—without breaking your budget.

HVAC Installation

A high-performing HVAC system isn’t just about buying the latest model—it’s about installing a solution that aligns with your home’s layout, airflow needs, and energy goals. Our team handles every step of the HVAC installation process, from load calculations to duct design, ensuring your heating and cooling system delivers reliable comfort without overworking.

HVAC Maintenance

Every HVAC system needs routine care to stay efficient and avoid mid-season breakdowns. Our HVAC maintenance visits go beyond basic checks—we fine-tune performance, clean key components, and identify issues early to prevent them from turning into expensive HVAC repairs.

HVAC Repair

Noticed inconsistent temperatures or strange sounds coming from your system? Maybe the airflow feels weak, or your thermostat isn’t responding like it should. These are signs your unit needs an HVAC repair. Whether your issue stems from a failed capacitor, blocked duct, or malfunctioning control board, we’ll get your heating and air conditioning system back in action.

HVAC Replacement

Older systems lose efficiency, struggle with temperature control, and often cost more to run than to replace. We help homeowners in Carlsbad choose energy-efficient options tailored to their home’s size, layout, and comfort goals. Once installed, we walk you through system features and tips for long-term care so you get the most from your HVAC replacement.

Heating Services

Even in Carlsbad, the temperature can dip low enough to make your home feel uncomfortable—especially in the early mornings or during cool evenings. That’s when you really appreciate having a dependable heating system in place. Guthrie & Sons provides home heating solutions designed to bring comfort, reliability, and efficiency to every room in your house.

Whether you’re dealing with an aging heater, planning a new installation, or just want to stay ahead of future issues, we offer a full range of heating services in Carlsbad.

Heating Installation

We install furnaces, heat pumps, and ductless mini splits that are built for performance, durability, and energy-efficient operation. Our team takes time to understand your home’s layout and heating needs so we can recommend the right equipment, properly sized for consistent comfort and smart temperature control.

Heating Maintenance

Our seasonal heating maintenance service includes cleaning critical components, checking for wear and tear, testing airflow, and verifying that your system is operating safely. Preventive care keeps your indoor climate balanced, helps avoid mid-winter breakdowns, and protects your investment by extending your system’s lifespan.

Heating Repair

Maybe your heater won’t turn on, blows lukewarm air, or makes loud, unfamiliar sounds. Whatever the issue, our technicians respond quickly with expert diagnostics and real solutions. We don’t waste your time or push unnecessary fixes. Instead, we get to the root of the problem and make sure your heating repair solves the issue.

Heating Replacement

During a heating replacement, we’ll evaluate your current setup, talk you through modern, energy-efficient options, and help you choose the right solution for your space and budget. Our team handles everything so you can enjoy better comfort, lower energy use, and peace of mind for years to come.

Furnace Services

When the cool coastal air settles in, a reliable furnace can make all the difference. Whether you’re installing a new system, troubleshooting a noisy unit, or prepping your equipment for the season, Guthrie & Sons offers professional furnace services in Carlsbad to keep your home warm, efficient, and worry-free.

We work with all major brands and system types, providing expert guidance and honest service at every step.

Furnace Installation

Every home has different heating demands, and installing the right furnace starts with understanding yours. We take into account square footage, insulation levels, and air flow patterns to size your system correctly and avoid common problems like short cycling or uneven temperatures.

Furnace Maintenance

Think of annual furnace maintenance as your system’s health check-up. It’s the best way to catch minor issues before they snowball into expensive problems. We inspect burners, test the heat exchange, check electrical components, and make sure your system is running safely and efficiently.

Furnace Repair

Some problems are hard to ignore: a heater that won’t turn on, unusual banging or rattling noises, or rooms that stay chilly no matter how high the thermostat is set. When that happens, we’re ready to step in. Our team specializes in fast, accurate furnace repair, from worn-out blower motors to clogged filters and failing ignitors.

Furnace Replacement

Outdated systems can drive up energy use, deliver poor temperature control, and even pose safety risks. We’ll help you choose a new, energy-efficient furnace replacement that fits your home’s needs and budget. Our team will remove the old unit, handle the installation, and make sure everything’s running perfectly before we leave.

Indoor Air Quality Services in Carlsbad, CA

You might not always see what’s in the air, but if your home feels stuffy or dusty or triggers allergies, your indoor air quality could be the culprit. At Guthrie & Sons, we offer indoor air quality services in Carlsbad to clean, balance, and refresh the air in your home.

Whether you're dealing with high humidity, lingering odors, or poor air flow, we’ll help create a healthier indoor climate that supports your comfort and well-being.

Air Purifier Installation

We install whole-home air purifiers that trap dust, pollen, and airborne irritants for cleaner, healthier indoor air. Connected to your HVAC system, they purify every room at once.

Air Purifier Repair

If your air purifier isn’t doing its job, we’ll inspect and repair it fast. Restore your indoor air quality without missing a beat.

Dehumidifier Installation

A whole-home dehumidifier helps reduce mold, musty odors, and excess moisture. We’ll install a system that balances comfort and air quality.

Dehumidifier Repair

If your dehumidifier isn’t draining or controlling humidity, we’ll get it working again. Quick service keeps your indoor climate under control.

Duct Sealing

Leaky ducts spread dust and waste energy. We seal your ductwork to improve airflow, temperature control, and efficiency.

Media Air Cleaner Installation

Media air cleaners capture fine particles other filters miss. We install high-efficiency units that support allergy relief and better air quality.

UV Air Cleaner Installation

UV air cleaners kill bacteria, mold, and viruses in your HVAC system. We install systems that improve your home’s air from the inside out.

UV Light Installation

Installed near your coils, UV lights help prevent microbial growth. Cleaner equipment means better air quality and improved system performance.

Home Safety & Comfort Controls

In Carlsbad, a well-balanced home isn’t just about heating and cooling — it’s about reliability and everyday peace of mind. When essential systems aren’t installed properly or start to fail, it can affect both your comfort and your safety.

Our home safety and control services in Carlsbad help everything behind the scenes run more smoothly. With thoughtful upgrades and dependable support, we help make your home more comfortable, efficient, and secure.

CO Detector Installation

Protect your family with properly placed carbon monoxide detectors. We install reliable units to ensure constant monitoring and safety.

Thermostat Installation

We install programmable and smart thermostats that improve temperature control and save energy. Take full control of your indoor climate today.

Thermostat Repair

A faulty thermostat can throw off your heating and cooling. We troubleshoot and repair issues to restore consistent comfort.

Thermostat Replacement

Upgrade to a modern thermostat with better features and energy savings. We’ll replace your old unit and handle the setup for you.

Solar Services in Carlsbad, CA

The sun shines almost every day in Carlsbad, so why not put it to work for your home? At Guthrie & Sons, we design and install solar energy systems that help you take control of your power, cut utility bills, and reduce your dependence on the grid.

From rooftop solar panel installation to backup batteries and EV chargers, we make clean energy simple and stress-free. Choosing solar isn’t just about today’s savings—it’s a smart investment that protects you from rising energy costs and adds lasting value to your property. When you’re ready to make the switch, we’re ready to make it seamless.

Heat Pump Water Heater Services in Carlsbad, CA

Hot water doesn’t have to come at a high energy cost. With a heat pump water heater, your home can enjoy reliable hot water while using a fraction of the energy of traditional systems. These systems pull warmth from the surrounding air, making them an incredibly energy-efficient option.

At Guthrie & Sons, we install and service heat pump water heaters that are built for long-term performance and lower utility bills. Whether you’re upgrading an old tank or looking to improve your home’s efficiency, we’ll help you choose the right model and handle the entire process from start to finish. It’s a simple way to save energy, cut costs, and upgrade your daily comfort—all at once.

Frequently Asked Questions

Yes—by reducing moisture, your system won’t have to work as hard to cool your home. That means better energy efficiency and lower utility bills year-round.

We install central air, ductless mini splits, heat pumps, and high-efficiency systems. Our team helps you choose the right fit based on your home, needs, and budget.

Absolutely. Our USA Membership Plan includes seasonal tune-ups, priority scheduling, and repair discounts—all designed to save you money and keep your system running smoothly.

Dirty filters, low refrigerant, thermostat issues, and electrical failures are all common. Regular maintenance helps catch these early and avoid costly repairs.

Most installations are completed in one day. We’ll handle everything quickly and cleanly—so you’re back to comfort with minimal disruption.

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.

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.

Erin Guthrie

19:21 03 Sep 25

Daniel was quick and professional. Fixed our AC problem in an hour and the price was very transparent and beyond fair. Didn’t push the subscription maintenance service, simply said it would be a good idea due to the age of our unit. Highly recommend!

Tomankhamen

18:03 28 Aug 25

We had to replace a thermostat that had gone bad. In the old days, I could do it myself. Now, though, the programming of the thing requires technical knowledge that I don’t have. The Guthrie guy that did the job was courteous, professional, and as fast as anyone could be. This has been our experience with Guthrie & Sons for every repair, retrofitting, and equipment replacement that they’ve done for us over quite a number of years now.

Gabrielle Benjamin

18:15 25 Aug 25

Carson Snyder and co-worker (Pablo?) did a great job on the installation of the mini-split cassette. They're hard working, they clearly knew what they were doing, polite, cleaned up afterwards, true professionals. I'd gladly recommend these two gentlemen. However, the Company was not good at keeping me informed although I mentioned to the salesman up front that I was information driven. They were short on details and communicated seldom. Anthony did tell me about the government program available that reduced my cost. I wouldn't have known about it if he didn't mention it. The City did approve their work and signed off on the permit which is an indication of the job done right. I think the Company can improve their customer service

robert johnson

00:53 11 Aug 25

Very pleased with the service we received from Guthrie & Sons! Our AC system needed to be replaced after a huge leak. The tech that came out for diagnosis, Mario, took the time to explain the issue to us, as well as our options for repair. They came out on a Saturday to diagnose and it was fixed the following Tuesday. Matthew was the worker that completed the repair and he did an excellent job. Pricing was reasonable. Much more reasonable than the first company we had come out to take a look. We upgraded our system and our SDG&E bill has already gone down. Highly recommend!

K N

15:52 01 Aug 25

Very knowledgeable and professional. Quoted product was high quality and fair pricing. I highly recommend We ended up not going with them only due to the fact we were also getting Solar and ended up going with one company for our project but I would definitely do business with this company in the future if we need it!

LeRoy Lafferty

17:25 31 Jul 25

We had Guthrie and Sons replace our 50 year old house heater with a heat pump. We are very satisfied with the installation performed by Matthew and Andriy. We were impressed with the detail of their work. They paid particular attention to the required sealing and insulating of the system. Even the HERS testing inspector was impressed with their work. We were also impressed by their professionalism and honesty. They gave us an unexpected partial refund off our signed contract.

Nannette Moyer

17:41 29 Jul 25

We have been using Guthrie & Sons for 3 years and I really can’t say enough good things about them. Our technician Mario was incredibly helpful with our most recent AC issue. He spotted the problem quickly and was very knowledgeable when explaining what was happening. I appreciate their honest and fair pricing and would recommend to family and friends. Glad to have an honest company especially with all the price gauging company’s out these days.

Meghan Venanzi

23:31 22 Jul 25

We were incredibly impressed with the prompt and professional service! We called on a Saturday morning, and within just a few hours, a technician was at our home. With the recent heat, getting our AC back up and running was a top priority—and they delivered! Mario clearly explained our options and provided a hassle-free solution that was both quick and effective. The repair was completed shortly after we gave the go-ahead. We’ll absolutely be using them again for any future HVAC needs. Highly recommend this company for their affordability, efficiency, and friendly service—we’re already telling our family and friends! Thanks again Guthrie & Sons!

Laurie Edwards

22:10 16 Jul 25

We were very happy from start to finish. Vlad did a great job in helping us decide what would be best for our house and our needs and the installation crew were the very best. Thank you Guthrie and Sons for a job well done.

Patrice Makovic

17:45 09 Jul 25

Last summer, I used Guthrie and Sons to replace my heating system with a new one and added an air conditioning unit. We also added two different zones in the house to be able to turn the system on independently from one zone to another. From the first contact to the six month maintenance visits, everything has gone smoothly. There were a couple of hiccups, but the company is very responsive and I have never had an issue with them not promptly responding and taking action to figure out and solve any problem. I highly recommend this company.

Carrie Reese

17:06 08 Jul 25

Guthrie & Son's did an amazing job on our new AC units. From sales through install they were all knowledgeable and helpful. They were very quick to get us all setup and when our home posed some unexpected issues they were able to pivot quickly and resolve them. I'd highly recommend them!

Kenneth Adelson

16:04 07 Jul 25

Had use Guthrie in the past for HVAC service, this time had them install a solar attic fan and additional vent. The service, as it had been the first time, was professional, polite, and on schedule. Pricing was fair (and consider that they offered a repeat customer discount without having to be asked). Would be happy to use them again when the need arises.
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.

Patrick Smith

21:42 27 Jun 25

We had central heat and air put in two a year and a half ago. We've need to make a few adjustments to airflow to rooms since then. Each time, they are onsite withing 1-2 days and have resolved the issue each time. Their team is professional and incredibly friendly and knowledgeable. Very happy we went to Guthrie & Sons.

Bennie Beans

15:41 12 Jun 25

Mario was knowledgeable and courteous. He made sure our system would be sized right and that our existing ductwork was able to support the new system. The install team were prompt and efficient. They installed drop cloths and cleaned up inside and out after the job. So far I’ve been very happy with the work Guthrie and Sons have done for us.

Chris Toogood

21:52 06 Jun 25

Great local family business. And you actually get a live person when you call... And the technician was great and they come out quickly. No up selling too. He gave me two different price options on fixing my problem... band aid cheaper way or replacement. Great service.

Nick Schoch

17:58 27 May 25

Jonathan recently inspected the HVAC systems at both my front and guest houses, and I couldn’t be more impressed with his service. He was thorough in his assessment, clearly identifying areas of concern and explaining the recommended repairs in a way that was easy to understand. What stood out most was his honesty and patience—he took the time to answer all my questions without rushing, and I genuinely felt he had my best interest in mind. If you're looking for someone who is knowledgeable, professional, and respectful of your time and property, I highly recommend asking for Jonathan.

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!

Make an Appointment With Our Team Today

Want a more comfortable, energy-efficient home? Let Guthrie & Sons Heating, Air & Solar take care of your HVAC and solar needs so you can focus on enjoying life by the coast. Schedule your heating, air conditioning, or solar service in Carlsbad today by calling (619) 269-3013 or booking online. We’re here whenever you need us!

8248 Ronson Road
San Diego, CA 92111

(619) 269-3013