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.

Up to $1,000 Off a New System

Receive up to $1,000 in manufacturer rebates on select systems. Not valid on “Worry Free System”. Must mention promotion at time of estimate appointment. Not valid on prior sales. Cannot be combined with any other offers. Restrictions apply. See dealer for details. Offer expires 10/31/2026.

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. Not valid on “Worry Free System”. Valid on residential properties only. Cannot combine with other offers. Must mention promo at time of estimate appointment. Restrictions apply. See dealer for details. Offer valid for an estimate appointment scheduled before 10/31/2026.

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 10/31/2026.

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 10/31/2026.

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.

Veronica Gomez profile picture
Veronica Gomez
4 weeks ago
I recently scheduled an AC repair with Guthrie & Sons during the San Diego heat wave. Unfortunately, a same-day appointment wasn’t available, and we had to wait nearly a week for service. However, given the extreme temperatures and likely high demand, I completely understand the scheduling challenges. The appointment process itself was easy and straightforward. Communication was excellent throughout, with timely updates and confirmation of our appointment. Our technician, Daniel Wilson, was professional, knowledgeable, and able to diagnose the AC issue immediately. He identified a faulty capacitor and addressed the problem efficiently. My only reservation was the $475 cost to replace the capacitor, which seemed somewhat high for the repair. However, I appreciated the prompt diagnosis, professionalism, and overall smooth service experience. Thank you to Daniel and the Guthrie & Sons team for your assistance!
L A-G profile picture
L A-G
1 month ago
Vlad T at Guthrie & Sons gave me a lot of information and recommendations for air conditioning for our house. He was professional and knowledgeable and gave me pros and cons for all of the options. I highly recommend working with him.
My husband and I were so concerned about our Air Conditioner needing repair. First, an extreme heat wave is expected this week, and we couldn’t afford a huge AC repair bill. When I opened my front door, I was greeted by a kind smile. Zach listened to me explain the issue, asked a few questions, and promptly tested the unit. He was professional and honest. Zach explained that we needed a new capacitor, and assured us that everything else looked good. He showed me the old part and patiently suggested options that I had on ways to replace the part, and where I could purchase it, should I choose to do so. Zach also didn’t try to pressure us into buying something that we really didn’t need, like a total replacement. I have dealt with high pressure scammers before. Zach is different. He really cares. I will definitely be sharing this business with any of my family and friends who need assistance with their air conditioning, and we will call Zach if we ever need help again. Thanks again Zach!
Nancy Beattie profile picture
Nancy Beattie
1 month ago
Guthrie & Sons installed, and all electric heat pump system for myAC And heating needs. Vlad Thoroughly surveyed my home and needs, answered my many questions, and designed the system as well as additional options. Installation was scheduled in just a few days, and Christian, Michael, and.Andriy showed up on time and completed the installation in just one day. The small space and limited access where my old furnace had been became an issue, but Michael presented a creative solution that worked. I couldn’t be happier and would not hesitate to recommend Guthrie.&Sons.
Minh N profile picture
Minh N
2 months ago
I had my HVAC system replaced by Guthrie & Sons and was impressed throughout the entire process. The crew showed up right on schedule, laid down drop cloths, draped the work area with plastic, and handled the removal and installation with care. Everything was completed in one day, exactly as promised. A minor issue came up after the install, and they responded right away and fixed it without any hassle. Professional, reliable, and easy to work with. Highly recommend.
Dan Davidson profile picture
Dan Davidson
2 months ago
Our Technician Zach was extremely Knowledgeable and professional when it came to our HVAC system. He also has great communication skills when describing any issues with our system. I would highly recommend Guthrie & Sons Heating, Air, and Solar.
John Wood profile picture
John Wood
2 months ago
Every part of this experience shows the value of working with well-organized and personable firms. From the moment I contacted Guthrie & Sons, every part of the experience has been first-rate. I had one cheaper quote, but the professionalism of this team convinced me that with an investment like this, it was worth it to work with THE A TEAM. Highly recommend!
Easy company to work with and quick scheduling from initial consultation to work completed. Mario came out for the initial consultation and James & Andriy completed the work of replacing our ducts. All three were professional, kind, and informative. I was surprised they were able to take out our duct work and replace it all in one day and I super appreciate that they crawled around in our short attic in this summer heat. They will be my recommendation for hvac needs.
Rex Roe profile picture
Rex Roe
4 months ago
Guthrie and sons are our Go To for all things AC! Easy to schedule service and very friendly staff. Mario came out today and quickly determined our issue and got us back on track. Thanks so much!
jacqulinet1 profile picture
jacqulinet1
4 months ago
I am very pleased with the service I received for replacing my furnace in my second story condo. This company really tries to please their customers, which is rare these days. Matthew and James were pleasant, knowledgeable and patient with my questions. The office was great about staying in touch regarding date and time to expect the technicians and providing the number to call for questions. I sam so happy I chose this company to do the job.
Keith Mar profile picture
Keith Mar
4 months ago
I was told by a couple other companies that I needed to replace my system. Vlad came out and made sure that my old system actually needed to be replaced and found it could be fixed for a fraction of the price. I appreciate the honesty and would definitely recommend. Edit the technician came out and made the repairs. He did a good job of explaining the situation and giving a couple options.
Darrell Brookstein profile picture
Darrell Brookstein
5 months ago
Have dealt with Guthrie & Sons regularly for more than 12 years. They are super good in every way re: heating and A/C. Special shout-out to their service man, Mario F, who checked out our systems yesterday. He was extraordinary and really helped us on several issues we noted, and a couple of issues he brought to our attention. Kudos!
Jim Hainline profile picture
Jim Hainline
5 months ago
We had Rob from Guthrie & Sons come out to repair one of our A/C units. Rob was very friendly and professional. Rob resolved the problem quickly. As far as price goes, I paid a higher flat fee 12 years ago from one of the larger local companies. I'm very impressed with pricing and quality of work. I highly recommend Guthrie & Sons and Rob.
Amy Graeber profile picture
Amy Graeber
5 months ago
Great experience! The company confirmed my appointment and let me know who my technician was via text. They also updated me when he was on his way. The technician was friendly and knowledgeable. I’d recommend Guthrie & Sons to friends and family.
Bobby Orozco profile picture
Bobby Orozco
7 months ago
Great experience working with Guthrie & Sons from start to finish. Vlad was awesome. He was incredibly knowledgeable and explained everything in detail. Stark contrast from other companies we received bids for. Christian and his crew did a great job on the install everything was smooth from start to finish. I would definitely recommend this company here in Murrieta.
Sharon Troeger profile picture
Sharon Troeger
7 months ago
Guthrie & Sons has always been super professional and knowledgeable about our system. They did the install a few years ago and have continued to maintain it for us. This year we noticed that our system wasn't performing as well, so when Wayne came out, he noticed a likely leak and was back 2 days later to find and fix it. He was quick, professional, and just extremely nice! 100% recommend.
Jeff Haight profile picture
Jeff Haight
8 months ago
Called one of the "big guys" in town and the estimate to do what needed to be done to diagnose my problem was nearly 1/2 the cost of the system when I purchased it and had it installed 5.5 years ago, I found Guthrie & Sons and they came out the same day and did the same work for 1/4 the price I was quoted for the same exact work! Daniel was friendly, honest and quickly got my system working as expected. I even purchased the service plan so I don't have future problems. I highly recommend these guys, they were awesome, don't get ripped off call Guthrie & Sons!!!
Rocky profile picture
Rocky
8 months ago
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
9 months ago
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
9 months ago
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!

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.