Solar and HVAC Services in Oceanside, CA

Professional HVAC Services Designed for Total Home Comfort

Need a quick AC repair? Thinking about upgrading your heating system? Curious if solar power could save you money? At Guthrie & Sons Heating, Air & Solar, we’re your all-in-one team for home comfort in Oceanside.

With transparent pricing, skilled service, and no pushy sales, we’ll make sure your home or business stays comfortable — today, tomorrow, and for years to come. Contact us for an estimate!

Oceanside’s Choice for Cooling, Heating, Indoor Air Quality, and Solar Services

Sunny days might be the norm in Oceanside, but that doesn’t mean your indoor comfort takes care of itself. When the heat kicks up or the ocean breeze turns cool, Guthrie & Sons is here to keep your home or business feeling just right. Whether you're in a beachside bungalow near the Oceanside Pier or running a shop off Mission Avenue, our HVAC services are built for the way Oceanside lives. From AC installs to heater tune-ups, indoor air upgrades to solar solutions — we handle it all under one roof.

At Guthrie & Sons, we’re more than a business — we’re a family legacy. Passed down through generations, our company is built on trust, care, and a commitment to doing things the right way. That means when you call us, you get the family treatment — genuine care, honest solutions, and no pushy sales.

And with NATE-certified technicians who are truly the best in the business, you can expect five-star service every time. Contact us today — we’re ready to help!

The Guthrie Way

Service Backed by Integrity, Experience, and Family Values

As a family-owned company with our name on the line, we take great pride in our work. That means we do things the Guthrie Way. Here’s what you can expect when you call us for service:

5-Star Service

We take pride in setting the gold standard for HVAC service in the local area. Our dedicated team of experts is committed to delivering nothing less than 5-star service in every aspect of our work. Your comfort is our commitment.

Honest Pricing

When we say no hidden fees, we mean it. Our pricing is upfront and transparent, with no fine print or gimmicks. Before we get to work, we’ll walk you through your options and give you a clear breakdown of the costs.

Expert Technicians

Not all technicians are created equal. Ours are NATE-certified — the highest standard in the industry. Whether it’s a simple repair or a complex installation, we bring experience and expertise to every home we enter.

Family Values

We’ve been family-owned and operated for generations, and we treat every customer like one of our own. We’re proud to bring personal care and dedication to every job. When you call us, you’re not just getting a service — you’re becoming part of the Guthrie family.

No Upsells

We’re not here to sell you what you don’t need. Our job is to find the best solution for you, not our bottom line. You can always count on our team for honest recommendations that prioritize your needs and your budget.

Protect Your Home and Wallet With Our USA Membership Plan

Your comfort, health, and safety are our priorities, and we know that a reliable heating and cooling system is key to all three. While plenty of Oceanside HVAC companies offer maintenance plans, our USA Membership Plan goes further to better meet your needs and save you money.

Regular maintenance is the best way to avoid costly repairs and keep your system running longer. We’ll reach out when it’s time for service in Oceanside, so you never miss a tune-up, even with your busy schedule. As a member, you’ll enjoy repair discounts, lower service call fees, and priority scheduling. Talk to your technician about signing up, or give our office a call to learn more!

Maintenance Plans

Budget Concerns? We Offer Flexible Financing for Your Comfort Needs

Nobody plans for a heating or cooling system to fail, but when it happens, Guthrie & Sons has options to help make investing in new equipment more affordable. Our flexible financing options help you get the heating and cooling system you need now while paying over time. Ready to explore your options? Call us at (619) 269-3013 — we’ll walk you through everything.

Learn More About Financing

Air Conditioning Services in Oceanside

Trust Guthrie & Sons for reliable air conditioning services in Oceanside — from energy-efficient upgrades to expert repairs. We’ll even walk you through available tax incentives and rebates to help you save more in the long run. Whether you’re cooling a home near El Camino Real or a property just off Coast Highway, we bring the same care and attention to every project.

Air Conditioning Installation

Guthrie & Sons is an expert in air conditioning installation, specializing in new constructions and homes without existing AC. We design custom systems to fit your space, enhance energy efficiency, and maintain a cool environment. We handle everything from ductwork to system selection.

Air Conditioning Maintenance

Safeguard your system from expensive malfunctions with our air conditioning maintenance in Oceanside. Our skilled technicians conduct tune-ups to enhance your AC's efficiency and prolong its lifespan.

Air Conditioning Repair

If your AC is struggling, making strange sounds, or refusing to power on, it's time for professional air conditioning repair in Oceanside. Guthrie & Sons swiftly diagnose issues using state-of-the-art tools and years of expertise.

Air Conditioning Replacement

Is your air conditioning unit over a decade old, constantly needing repairs, or just inefficient? It might be time for an air conditioning replacement in Oceanside. Our team will guide you in choosing the right energy-efficient system, promising improved cooling and reduced energy bills.

Mini Split Services in Oceanside

Enjoy personalized comfort and better efficiency with a ductless mini split system for your Oceanside home. With zoned control, you can heat or cool only the rooms you use — and save on energy in the process. Whether you're planning a new install or servicing an existing unit, Guthrie & Sons delivers dependable ductless mini split solutions in Oceanside. We’ve helped homeowners across the city — even tackling unique setups near Buccaneer Beach — and we’re ready to help with yours too.

Mini Split Installation

Ductless mini splits are ideal for heating and cooling spaces like remodeled garages, sunrooms, or guest suites without the significant labor associated with ductwork installation. We tailor and install ductless mini split systems to meet your specific requirements.

Mini Split Maintenance

Coastal living can affect your system due to salty air, dust, and daily use. Especially in our coastal climate, it's crucial. Our ductless mini split maintenance includes thorough filter cleaning, refrigerant level checks, and electrical component inspections.

Mini Split Repair

If your mini split isn't warming or cooling as it should, shows error messages, or has inconsistent cycles, a ductless mini split fix can solve the problem. We'll promptly spot issues such as leaks in the refrigerant, electrical glitches, or defective sensors and bring back your comfort swiftly.

Mini Split Replacement

If your mini split struggles, needs regular repairs, or increases your energy bills, a ductless mini split replacement could be ideal. We assess your current unit and suggest a new, energy-saving model suitable for Oceanside's climate.

Heat Pump Services in Oceanside

Are you in search of an energy-saving solution for heating and cooling your home? Heat pumps are efficient in regulating temperature, thereby eliminating the need for separate systems. At Guthrie & Sons, we are experts in providing heat pump services in Oceanside.

Our comprehensive offerings include installation, maintenance, repair, and replacement, ensuring your home maintains comfort all year round. Homeowners near spots like the Oceanside Harbor and the Sunset Market count on us when comfort matters most.

Heat Pump Installation

Opting for a heat pump installation is a savvy move for Oceanside homeowners seeking efficient heating and cooling without separate systems. We will examine your home's layout, insulation, and energy needs to propose the best unit.

Heat Pump Maintenance

In Southern California’s climate, heat pumps are always on duty, so regular upkeep is essential. We suggest twice-a-year check-ups for your heat pump to monitor coolant levels, clean the coils, and guarantee that every part is working as it should.

Heat Pump Repair

Over time, heat pumps may show signs of problems with regular use. You might notice reduced airflow, uneven cooling, or odd sounds. Our team quickly diagnoses these issues, identifying problems like refrigerant leaks, electrical faults, or sensor issues.

Heat Pump Replacement

If your system frequently needs repairs or has completely failed, a new heat pump can save you hassle, cash, and worry. Older models lose effectiveness, increasing energy costs. Our team will install a modern, efficient system ensuring comfort and lowering expenses.

HVAC Services in Oceanside

Whether your home relies on a single unit or a full HVAC setup, including air conditioners, furnaces, or heat pumps, we're here to help. We provide top-notch HVAC services in Oceanside, ensuring your systems always run smoothly. We know the layout of Oceanside like the back of our hand — including neighborhoods from Fire Mountain to South Oceanside.

HVAC Installation

Setting up a new HVAC system isn't just about selecting a unit - it's about finding the best fit for your home. We assess your space, considering size and ventilation needs, to suggest the ideal heating and cooling solution for lasting comfort.

HVAC Maintenance

Ignoring HVAC maintenance is like neglecting car oil changes — problems will inevitably arise. We adhere to manufacturer's instructions and our checklist to detect issues early and keep your system efficient.

HVAC Repair

Hearing unusual sounds, poor air circulation, or rooms not warming or cooling evenly? These are signals your HVAC system needs help. Ignoring these could turn a small issue into a big problem. We're ready to respond, diagnose the problem, and offer professional HVAC repairs.

HVAC Replacement

Are you tired of constant repairs and escalating energy bills? It's time to plan for an HVAC replacement. We ensure a swift and smooth installation process causing the least possible disturbance. Once the system is operational, we'll guide you on its usage and provide tips on its upkeep.

Heating Services

Cool mornings and breezy nights are part of life in Oceanside — but staying warm at home shouldn’t be a struggle. Whether you rely on a furnace, heat pump, or mini split, our expert heating services are here to keep things running right. From routine maintenance to full system replacements, Guthrie & Sons helps Oceanside homeowners stay cozy year-round.

Heating Installation

Looking to heat your home? Our team is ready to guide you in choosing the ideal heating system. Whether it's a furnace, heat pump, or mini split, we're committed to explaining your options and installing a durable system.

Heating Maintenance

Your heating system requires more than just a fresh air filter to remain at peak performance. When you reach out to us for heater upkeep, we'll meticulously clean, scrutinize, and adjust each component. This results in less malfunctions, reduced energy expenses, and a significant increase in comfort.

Heating Repair

When your heating systems starts blowing cold air or making eerie sounds, it's time to contact us. We'll identify the problem, explain the solution, and restore warmth to your home. No dodging, no extra costs — just honest, effective heating repairs.

Heating Replacement

If your heating system is nearing its end, replacing it doesn't have to be difficult. We'll guide you through the process to find a system that's efficient, reliable, and fits your home. After installation, we'll test it, adjust it, and teach you how to maintain it.

Furnace Services in Oceanside

Furnaces are essential for Oceanside homes during those brisk mornings and cool evenings, offering reliable, quick warmth throughout the house. Whether you're in the process of installing a new system, performing regular maintenance on an existing one, or thinking about an upgrade, our comprehensive furnace services in Oceanside are designed to ensure your home remains warm and comfortable during the winter months.

Furnace Installation

A too-large furnace can short cycle, wasting energy and wearing out sooner. Conversely, a too-small one will struggle to maintain warmth. Therefore, we accurately size and install your furnace to match your home's specifications.

Furnace Maintenance

Having your furnace checked annually, preferably before the chill of winter sets in, is the most effective way to ensure it operates safely and smoothly. Our furnace upkeep service comprises burner cleaning, heat exchanger inspection, gas leak detection, and thorough testing of all safety measures.

Furnace Repair

Odd sounds, poor circulation, and chilly spaces that never seem to heat up could indicate that your furnace requires fixing. If your system is pumping out cold air or refuses to switch on, our heating and cooling experts will promptly tackle the issue to restore your warmth.

Furnace Replacement

If your heating system is beyond repair or too costly to operate, a furnace replacement could be the best option. We manage everything — from safely removing the old model and disposing of it, to expertly installing your new, energy-efficient furnace.

Indoor Air Quality Services in Oceanside

Experience the freshness of Oceanside's air in your own home with our indoor air quality services. We combat dust, allergens, and pollutants, that can quickly accumulate, with our range of services including air purifiers and dehumidifiers. Our expert team ensures optimal air quality through professional installation, repairs, and maintenance, helping you breathe easier in Oceanside. Whether you’re near the Oceanside Harbor or closer to the bustling downtown area, we’ve got your air quality needs covered.

Air Purifier Installation

For cleaner, healthier air in your home, installing an air purifier is a great option. We set up whole-home air purifiers that trap dust, allergens, and airborne pollutants.

Air Purifier Repair

When your air purifier isn't functioning properly, it may be time for repair. Whether it's a blocked filter or an electrical issue, we swiftly diagnose and solve problems, ensuring the return of clean air flow.

Dehumidifier Installation

If your house feels damp and musty due to high humidity, installing a dehumidifier can restore balance. We'll select and install the perfect system for your space.

Dehumidifier Repair

When your system isn't controlling humidity, a dehumidifier repair is required. We address problems like coolant leaks, defective sensors, and drainage issues.

Duct Sealing

Ducts with leaks lead to bad air quality, wasted power, and increased costs. Our duct sealing solution identifies and repairs these leaks, ensuring clean, treated air circulates as it should.

Media Air Cleaner Installation

If you're concerned about allergies at home, installing a media air cleaner can improve air quality. We install media cleaners that trap even the smallest particles.

UV Air Cleaner Installation

Installing a UV air cleaner gives you a strong shield against germs and allergens floating in the air. We set up UV air cleaners in your ductwork to wipe out bacteria, viruses, and mold.

UV Light Installation

Stop the spread of mold and bacteria in your HVAC system by installing a UV light. We position UV lights close to your coils. This helps to clean the air that flows through, keeping your system spick and span.

Home Safety & Comfort Controls in Oceanside

In Oceanside, a modern comfort system means more than staying cool — it means built-in safety and smarter control. But without the right devices, your home can feel unpredictable.

Our safety and control services in Oceanside help eliminate those problems and make every part of your system work for you.

CO Detector Installation

Setting up a CO detector safeguards your house from the harmful effects of carbon monoxide. We put in trustworthy detectors at crucial spots for round-the-clock surveillance.

Thermostat Installation

Proper thermostat installation can enhance comfort and cut energy use. We install smart or programmable thermostats that save you money.

Thermostat Repair

If your house feels overly warm or chilly, the problem could be a malfunctioning thermostat. Reach out for a thermostat fix to sort out issues with temperature and connectivity.

Thermostat Replacement

Old-fashioned or untrustworthy thermostats can result in discomfort and higher energy bills. We promise to suggest and set up a model that offers superior control and efficiency.

Solar Services in Oceanside

Capture the power of Oceanside's endless sunshine with Guthrie & Sons. We offer expert solar panel installation, battery backup systems, and EV charger solutions. These not only reduce your energy bills but also decrease grid reliance. By investing in solar, you opt for clean, renewable energy and guard against rising utility costs. Plus, solar is a wise, long-term investment and we'll guide you through every step. Our team is local with decades of experience. You can rely on our service now and for years to come.

Heat Pump Water Heater Services in Oceanside

Guthrie & Sons provides energy-efficient comfort to your Oceanside home with our comprehensive heat pump water heater installation services. Unlike conventional water heaters, our advanced systems harness the power of ambient air to generate heat. This innovative approach drastically reduces energy consumption and lowers your carbon emissions.

The benefits? You can enjoy reliable hot water round the clock, see a noticeable decrease in your utility bills, and contribute to a greener environment. All of this is backed by our expert team, who are dedicated to ensuring a seamless and efficient service delivery. From homes near the Oceanside Pier to those around the historic Mission San Luis Rey, we’re here to help.

Frequently Asked Questions

Yes! We provide free estimates on replacements for heating, air conditioning, and solar systems. Our team will assess your needs, explain your options, and offer clear pricing — no pressure, no gimmicks. You’ll know exactly what to expect before making a decision.

Absolutely. Our technicians are background-checked and committed to your safety and satisfaction. We only hire qualified, experienced professionals who meet our high standards. With Guthrie & Sons, you’re in trusted hands.

We understand that comfort can’t wait. In most cases, we offer same-day or next-day service, depending on availability. Just give us a call, and we’ll find a time that works for you.

Yes, we handle all necessary permits for your HVAC or solar installation. From navigating local regulations to submitting paperwork, we make sure everything is done by the book. You won’t have to worry about a thing.

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.

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!

Andrea Kossoudji

01:11 30 Apr 25

Great service!! Jonathan was patient, kind, knowledgeable and extremely professional! I love Guthrie & Sons’ reminder system, notification of the technician enroute, the easy invoice system and immediate emailing of the findings, including detailed photographs of the work completed!! Highly recommend!

james beedon

20:47 23 Apr 25

Last summer my air conditioner couldn't cool the house in the hottest period of summer. The HVAC team I was working with came in and said the coils were leaking, the unit was 20 years old. I requested quotes from 5 different companies, and the variation of prices was huge. I went with Guthrie and Sons for these reasons:1. Local Company2. Family Owned3. Great presentation, no pressure4. Good products5. Competitive pricingJust installed yesterday, so jury is still out on the system, but installation was thorough and great communication so far!

Darius Degher

21:45 22 Apr 25

Carson and Michael were brilliant. The heat pump installation went smoothly, and they are really pleasant and trustworthy fellows. The day after it was installed, I had a plumber at my house. He looked at their work and was impressed. He said it was much cleaner than the way HVAC people usually do it.

Lito Ricasata

19:03 08 Apr 25

First time prospective client of Guthrie and Sons. Very responsive staff in providing updates on my calls. Mario F. came over to check out my existing cooling and heating system and is very thorough and professional in providing necessary information related to repair/upgrades. Pending his quote, my experience with Guthrie and Sons is top notch and most highly recommended.Updated review: Kareen, Daniel and Michael worked on the AC replacement, relocation of furnace to the attic and replacement of ductwork. Very professional and knowledgeable team in my opinion. Completed the work in a timely and very satisfactory manner.

Michael Myers

00:19 25 Mar 25

My experience with Guthrie & Sons has been excellent, and I am pleased to write a very favorable review about it. They replaced three air conditioners and three propane furnaces with new equipment that utilizes heat pump technology. I had met with other companies and I was close to coming to a conclusion, when a friend recommended Guthrie & Sons. He told me that they are hyper focused on customer service from beginning to end.Their customer service started with the on line completion of a basic information form. Shortly after submitting that form, I heard from Zach who scheduled an appointment at my home.I had already met with three other HVAC contractors, and for that reason, I had some basic information about the systems available and how heat pumps work and whether propane furnaces should also be installed. I signed a contract on a Friday. By Wednesday of the next week they had completed the installation. Wow.The installation of one of the furnaces in the attic caused minor damage to the drywall. THEY BROUGHT IT TO MY ATTENTION and told me a drywall contractor would be in touch regarding its repair. Two days later it was repaired.Since installation, the equipment (heat pumps from Bosch) has been working great and I am optimistic about the future. Meanwhile, their pricing, warranty and terms are far superior to their competitors.Since this is an unusually long review and so favorable, let me add this: This is my honest, uncompensated opinion. I have no relationship with anyone at Guthrie & Sons other than the contract we executed.

Tom H

15:21 20 Mar 25

We recently had Guthrie and Sons install a Mini-Split system in our home. The entire process was handled professionally with no issues occurring at any time. The estimator (Vlad) went through options with us but let us evaluate the best solution for us with zero pressure. The installation team (Matthew and Aaron) showed up on time, reviewed the scope of the job, made sure they understood what we wanted, and then proceeded to complete the installation exactly as discussed. They asked for my input as needed so there were no surprises when the job was completed.They respected my property and made sure everything was left at least as clean was when they arrived. The job was completed on time and as promised and they reviewed the details of the system and its use clearly. I would definitely have Guthrie and Sons do other electrical/HVAC work should the need arise.

Mike Macias

19:43 19 Mar 25

I have been in the construction industry in San Diego for over 50 years. I owned my own contracting company for over 40 years. I have seen all levels of customer service in my years. The level of customer service from Guthrie and Son’s is among the best I’ve ever seen and received. Every time I hear anyone asking for a referral for HVAC work I immediately give them your number. When I recommend a company I in essence am putting my name and reputation on the line. I refer them with 100% confidence in the service they will receive. Thank you very much for your legendary service.

Scott Sypkens

23:32 11 Mar 25

We first hired Guthrie and Sons to replace a furnace after comparing proposals from several heating and air companies. They’ve since been back for annual check ups, and today Kareen came to diagnose and resolve an issue with our mini-splits. My experience each time, including today, is that they hire friendly, knowledgeable people who do good work. They’ve never tried to upsell or do anything unnecessary, which is the way it should be. I’d recommend them to anyone who asks.

Marilyn Rivas

20:07 09 Mar 25

They always come out quickly. They are so polite and careful.

Steven Wheeler

19:28 07 Mar 25

Good technician did everything right yet our heater still not workingJonathan gave us the likeliest problems so we’ll have to get it fixed

Dmitriy

04:01 07 Mar 25

My AC was not working for seven months. Three other companies tried to fix it with no success. Don’t make the same mistake I did—go straight to Guthrie & Sons! They are absolutely worth every penny.

Cecilia Benevich

22:17 05 Mar 25

Rick

21:38 05 Mar 25

Experienced technician gave me the particulars of a replacement HVAC system

Daylan Dauchot

21:28 05 Mar 25

Courteous, in-time, helpful, honest. Would recommend.

Xinxin Wang

22:05 04 Mar 25

Tom Barden

18:26 04 Mar 25

Adair Cooke

19:02 03 Mar 25

Jonathon is a great technician. He is very willing to answer any questions and explains things very well. He is very transparent with letting us know cost, finance options, different furnace models and anything else we want to know. I would highly recommend him to anyone looking for furnace repair or replacement.

Bratso Krsic

00:29 28 Feb 25

Guthrie and Sons took on the challenging project of installing an HVAC system at St. George's Serbian Orthodox Church of San Diego, CA. They were the only company among the six we consulted that saw the project through to the end. The members of our congregation are not just happy, but thoroughly satisfied with the heating and air conditioning. The system, split units/floor units with condensers outside, was installed with minimal intrusion onto the church's artwork. Despite the project taking longer than expected due to permit delays, the results were well worth the wait. We highly recommend Guthrie and Sons Heating and Air.

Schedule Service With Guthrie & Sons Today

At Guthrie & Sons Heating, Air & Solar, we don’t just show up — we show that we care. Whether your home needs a cooling upgrade, a reliable heater, or energy-saving solar solutions, we’re dedicated to providing service that puts you first.

With free estimates, upfront pricing, and flexible financing, we make repairs and upgrades more affordable. And when we’re done, we’ll leave your space just as we found it — only now it’s more comfortable and energy efficient, which means it feels great and is saving you more money. Now that’s a win-win!

Use our website or call (619) 269-3013 to schedule heating, air conditioning, or solar services in San Diego, California, with Guthrie & Sons Heating, Air & Solar.

8248 Ronson Road
San Diego, CA 92111

(619) 269-3013