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.

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 8/29/25.

$2,600 Federal Tax Credit on Heat Pump Water Heater

Valid on a qualifying heat pump water heater installation with electrical panel upgrade. Up to $2,000 (30% of cost) in Federal Tax Credits for a heat pump water heater and up to $600 (30% of cost) for an electrical panel upgrade.

Can be combined with state rebates only. Restrictions apply. See dealer for details. Offer valid for an estimate appointment scheduled before 8/29/25.

Up to $7,750 off a New System

Save up to $4,000 in Tech Clean Equity rebates, up to $1,150 in manufacturer rebates and up to $2,600 in Federal Tax Credits for a total of up to $7,750 off a new installation.

Valid on residential properties only. Cannot combine with any other offers or discounts. Must mention promo at time of estimate appointment. Must be income-qualified to receive Tech Clean equity rebate. Restrictions apply. See dealer for details. Offer valid for an estimate appointment scheduled before 8/29/25.

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 8/29/25.

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.

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!
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 Company
2. Family Owned
3. Great presentation, no pressure
4. Good products
5. Competitive pricing
Just 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.

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.

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