Indoor Air Quality

Indoor Air Quality Services in San Diego County for Cleaner, Fresher Air In Every Room

Having issues with allergies, dust, or musty smells? A quick indoor air quality assessment from Guthrie & Sons can help identify what’s going on and provide a solution. Our indoor air quality services target your biggest air quality concerns to help you breathe easier.

Indoor Air Quality Services That Bring You Better Health and a Happier Home

Even with all the sunshine and scenery San Diego offers, we still spend most of our time indoors, and indoor air can be two to five times more polluted than outdoor air. From dust and dander to mold, smoke, and chemical pollutants, what you can’t see might be affecting how you feel every day. That’s why Guthrie & Sons offers expert indoor air quality services in San Diego County and nearby areas like Temecula and Murrieta. Whether you need a brand-new system installed or service for the one you already have, we make it fast, affordable, and easy.

It all starts with a simple in-home air quality assessment—our team identifies the problem and walks you through smart, pressure-free solutions. Call our office or schedule online today to get started!

What Impacts Our Indoor Air Quality?

What Impacts Our Indoor Air Quality?

Some air quality issues are easy to spot—like visible dust or pet hair. But others? They’re hidden in your walls, your vents, and even your cleaning routine. From daily habits to deeper home system issues, a lot more affects your air than you might think.

  • Dust, pet dander, and pollen
  • Mold, mildew, and moisture buildup
  • VOCs from cleaning products, paint, and furniture
  • Poor ductwork design or air circulation
  • Unmaintained or aging HVAC equipment


The good news? Once you understand what’s floating around, you can do something about it. And we’re here to help you take that first step with real answers and real solutions.

Benefits of Installing Indoor Air Quality Systems

Benefits of Installing Indoor Air Quality Systems

Maybe you use a portable air purifier or leave a few windows open to freshen things up. It helps a little—but it doesn’t reach the air cycling through your vents or sitting in rooms you’re not in. Whole-home indoor air quality systems connect directly to your HVAC system to clean the air in every space, all the time.

These products help reduce allergy and asthma triggers, cut down on dust buildup, and keep humidity levels in check to prevent mold. You’ll also notice your HVAC system running more efficiently, which means lower utility bills. Indoor air quality systems don’t just improve how your air feels—they support your health and save you money.

Indoor Air Quality Services for New Installations, Repairs, and System Upgrades

Whether you’re just starting to think about IAQ or you’ve worked with another indoor air quality service before but now need more help, Guthrie & Sons is here for you. Our indoor air quality services in San Diego County include:

Whole-home air purifiers clean the air as it circulates through your HVAC system, removing particles like dust, pollen, pet dander, and smoke. They help reduce allergy symptoms, keep surfaces cleaner, and improve your overall comfort.

Our air purifier installation services involve integrating the system directly into your existing HVAC setup. We install it at the return duct, where it can filter air before it reaches your living spaces.

If your air purifier isn’t running efficiently, produces odd smells, or triggers alerts, we can help. Our air purifier repair service covers diagnostics, part replacements, and restoring proper performance.

Carbon monoxide detectors protect your family by sensing dangerous gas leaks from furnaces, stoves, or water heaters. They’re small, smart, and life-saving—essential in any home.

We offer carbon monoxide detector installation services for San Diego area homes and install them in key areas like hallways, near bedrooms, and adjacent to gas appliances for maximum coverage and peace of mind.

San Diego’s coastal climate may be beautiful, but the humidity can sneak into your home and linger. Whole-home dehumidifiers help pull excess moisture from the air, making it feel cooler, cleaner, and easier to breathe.

During your dehumidifier installation, we’ll install the unit directly into your HVAC system so it can pull moisture from the air before it spreads through your space. These systems also reduce the risk of mold growth, protect your home’s structure, and keep indoor air balanced.

If your system is making noise, not removing moisture, or constantly cycling on and off, a quick dehumidifier repair should be able to solve it. We troubleshoot the issue, explain what’s going wrong, and restore your system’s performance.

Your air ducts act like the lungs of your HVAC system, moving heated or cooled air to every room in your home. But if they’re full of dust, leaking at the seams, or poorly designed, they can send dirty air where it doesn’t belong—and cost you in comfort and efficiency.

We do duct sealing to find and close up leaks, gaps, or cracks in your ductwork that let air escape and pollutants sneak in. We use proven methods to make sure your system runs more efficiently, your air stays cleaner, and your home feels more evenly heated or cooled year-round.

Media air cleaners use deep, high-efficiency filters to trap more airborne particles than standard filters. They remove dust, pollen, smoke, and pet dander as air moves through your system. It’s a solid, low-maintenance choice for families with allergies or pets.

We offer media air cleaner installation services that fit seamlessly into your HVAC system. Once installed, they quietly go to work improving your air around the clock.

Your thermostat does more than set the temperature—it can influence how your entire system runs. Smart and programmable thermostats help regulate airflow and humidity, which both affect indoor air quality. With the right setup, you get more consistent comfort and better efficiency all around.

Our thermostat installation includes full setup—from mounting and wiring to syncing with your HVAC and indoor air quality systems. We install everything from basic digital units to advanced smart thermostats with Wi-Fi, remote access, and learning features that adapt to your schedule.

If your thermostat is acting up—like reading the wrong temperature or not responding—our thermostat repair service will fix it. We check wiring, sensors, and compatibility with your system to restore control. You’ll get clear answers and fast service.

Old thermostats can cause uneven temperatures, wasted energy, and limited functionality. With a thermostat replacement, we can upgrade your system with modern options like Wi-Fi and smart tech. You’ll enjoy better comfort and more control with fewer headaches.

UV air cleaners use ultraviolet light to neutralize airborne bacteria, mold spores, and viruses as they pass through your ductwork. They’re especially helpful for families with asthma, allergies, or anyone concerned about indoor germs.

In a UV air cleaner installation, we’ll place the unit directly inside your HVAC system, typically near the coil where biological growth is most likely. We handle everything from power setup to secure placement, ensuring maximum effectiveness.

UV lights keep your HVAC system cleaner by eliminating mold and bacteria from high-moisture areas like coils and drain pans. This helps reduce musty odors and keeps the air fresher. They’re a great fit for humid homes or anyone who wants to keep their system running more efficiently.

There’s no need for major modifications during a UV light installation; we install the unit cleanly and securely near the evaporator coil or drain pan without disrupting your ductwork or system layout. It’s a simple upgrade with a big impact on your home’s air quality and HVAC cleanliness.

From Air to Solar, We’ve Got Your Whole Home Covered

In addition to indoor air quality installation, repair, and replacement, we offer a full range of heating and air conditioning services—from fixing an old furnace to installing a brand-new air conditioner. Our team is also trained in solar panel systems and heat pump water heaters.

We’re a family-owned, San Diego-rooted business with NATE-certified technicians who are among the best in the industry. You’ll always get clear pricing, real recommendations, and work done right the first time. Need financing? We’ve got flexible options. Want a free quote? Just ask. We’ll always respect your home, your time, and your trust. Ready when you are—give us a call or book online today.

Frequently Asked Questions

We offer a range of solutions like media air cleaners, whole-home air purifiers, and upgraded HVAC filters that trap fine particles before they circulate. These systems are great for families with pets or anyone sensitive to airborne irritants. We can also check your ductwork for leaks that let dust sneak in. Let’s take a look and find what fits your home best.

Yes! UV air cleaners and whole-home air purifiers are excellent for targeting odors caused by pets, cooking, smoke, or mold. These systems don’t just mask smells—they eliminate the particles causing them. We’ll recommend the right combination based on what’s going on in your home.

Absolutely. We often help families breathe easier with solutions like HEPA-grade filtration, UV air cleaners, and humidity control systems. These reduce allergens, mold, and other irritants that trigger symptoms. We’ll guide you to options that offer real relief—no pressure, just help.

Yes, especially when your system runs cleaner. Air that’s properly filtered and humidity that’s in the right range both help your HVAC system work less. That can mean lower energy bills, fewer repairs, and a longer system lifespan. Clean air and better efficiency go hand in hand.

Heating and Cooling Offers You Can't Miss

Big savings, same great service. See what offers are available now for our favorite customers.

$625 Comfortably California Rebate

Valid on select systems. Valid on residential properties only. Can be combined with HEERHA rebates, $2,000 heat pump Federal Tax Credit and $600 electrical upgrade Federal Tax Credit. Rebate available until funds last. Restrictions apply. See dealer for details. Offer expires 3/31/26.

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 3/31/26.

Free Diagnostic w/ a Repair

Your diagnostic service call fee will be waived if you proceed with a repair.

Cannot combine with other offers. Restrictions apply. See dealer for details. Offer expires 3/31/26.

Free Estimate on a New Heat Pump Water Heater Installation

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

Restrictions apply. See dealer for details. Offer expires 3/31/26.

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.

Your Home Deserves Clean Air‒Request a Quote Now

As a trusted indoor air quality company in San Diego, Guthrie & Sons Heating, Air & Solar is here to help you take control of the air in your home. Whether it’s dust, humidity, odors, or airborne irritants, we offer lasting solutions that make your space feel cleaner, fresher, and more comfortable. Call or reach out online today for indoor air quality services in San Diego, California.