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?

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

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:

Air Purifiers

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.

Air Purifier Installation

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.

Air Purifier Repair

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

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.

Carbon Monoxide Detector Installation

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.

Dehumidifiers

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.

Dehumidifier Installation

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.

Dehumidifier Repair

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.

Air Ducts

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.

Duct Sealing

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

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.

Media Air Cleaner Installation

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.

Thermostats

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.

Thermostat Installation

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.

Thermostat Repair

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.

Thermostat Replacement

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

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.

UV Air Cleaner Installation

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

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.

UV Light Installation

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.

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.

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.

Jennie Cornsweet

00:10 28 Feb 25

Have been using Guthrie & Sons for several years now and purchase my new HVAC system with them. They do our yearly maintenance and have always been professional, efficient and reliable. Jonathan was the tech that came today and I want to thank him for his great work and great attitude.

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.

WATER HEATER

$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.

INSTALLATION

Up to $11,750 Off a New System*

Qualify for HEEHRA and you can get up to $8,000 in HEEHRA rebates, up to $1,150 in manufacturer rebates and up to $2,600 in Federal Tax Credits for a total of up to $11,750 off a new installation. Valid on residential properties only. Cannot combine with any other offers. Must mention promo at time of estimate appointment. Restrictions apply. See dealer for details. Offer valid until funds last.

REPAIR

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 5/31/25.

INSTALLATION

0% APR for 25 Months

Get 0% APR financing for 25 months on a new heating or air conditioning installation. 0% interest with 25 equal monthly payments. Financing subject to credit approval. 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 5/31/25.

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