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San Antonio Indoor Air
San Antonio Has an Allergy Season for Every Month
The calendar here is unforgiving. Mountain cedar pollen blows down from the Hill Country from December into February, and San Antonio sits right on the edge of the cedar belt, so Boerne, Helotes and the north side get it worst. Live oak takes over in March and April and coats every car in the city yellow. Grass and ragweed carry through summer and fall, and most summers a plume of Saharan dust hazes the sky for a week or two. Underneath all of it is humidity from the Gulf that keeps dust mites and mildew comfortable indoors for eight months a year.
Your air conditioner is the biggest air-quality tool in the house, and how well it filters, dehumidifies and circulates air decides how much of that calendar you feel indoors. A basic filter in a leaky attic duct system does little. A well-sealed system with the right filtration, a fan schedule that keeps air moving, and humidity held in a healthy range makes a difference you notice by the second week of cedar season. Radiant has been building those systems into San Antonio homes since 1999.
The technology, from MERV ratings to how a whole-home dehumidifier ties into the ductwork, is covered on our indoor air quality page. Here is how it applies to the air in this city.
- Diagnose, then recommend We check the filter, the ducts, the coil and the humidity before suggesting equipment. Sometimes the fix is sealing, not a purifier.
- Humidity is half the problem Dust mites, mildew and that musty smell all start with moisture. Dehumidification is often the first thing we recommend here.
- No pressure Options in writing, from a filter upgrade to a whole-home system, with honest notes on what each one will and will not do.
What You Notice
Air Quality Complaints From San Antonio Homes
Each of these points to a different fix. Matching the symptom to the cause is the whole job.
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Cedar fever indoors, December through February
Fine pollen getting past a basic filter and through duct leaks. Better filtration and sealed ducts are the answer, and they help with oak in spring too.
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A musty smell that never quite leaves
Humidity. The coil, drain pan or ductwork is staying damp. A coil cleaning plus a dehumidifier usually ends it.
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Dust on everything within days
Leaky attic ducts pulling in insulation fibers, or a filter that is too coarse for the house. Often both.
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Windows sweating and a clammy feel at 74 degrees
Indoor humidity running high. Common in tightly built newer homes in Alamo Ranch and Cibolo and in any house with an oversized AC.
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Waking up congested every morning
Dust mites, which thrive above 50% humidity, and whatever is settling in the bedroom overnight. Filtration and humidity control together.
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Stale air in a newer, tightly sealed home
Good insulation keeps the heat out and the air in. Controlled fresh-air ventilation solves it without wasting cooling.
What We Install
Indoor Air Quality Systems for the San Antonio Area
Most homes need one or two of these, not all of them. We will tell you which.
- Filter upgrades A thicker media filter in a properly sized cabinet catches far more pollen than a one-inch filter without choking airflow.
- Whole-house air filtration High-efficiency filtration at the air handler for the whole home. The most effective single step for cedar and oak season.
- Whole-home purifiers and air scrubbers For odors, smoke, and the biological growth that humidity encourages on coils and in ducts.
- Whole-home dehumidifiers Ducted into the system to hold indoor humidity in a healthy range even when the air conditioner is not running much.
- Duct sealing and cleaning Stops the attic from feeding dust into the system. Frequently the highest-value fix in a San Antonio home.
- Fresh-air ventilation Controlled outside air for tight newer homes, brought in through the filter rather than through gaps.
How It Works
An Air Quality Visit With Radiant
We would rather sell you one thing that works than three that might.
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Tell us what you are noticing
Symptoms, seasons and rooms. Congestion in January and a musty smell in August are different problems.
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Check the system
Filter, return, coil, drain, duct leakage and indoor humidity. Most air problems turn out to be system problems.
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Options in writing
Ranked by what will help most for your symptoms and budget. Honored for 72 hours, no hidden fees.
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Install and set up
Equipment installed at the air handler, controls configured, and a maintenance schedule so it keeps working.
Current Specials
Save on the work your home needs most.
San Antonio
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25% Off Select Air Purifiers & Filters
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San Antonio
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Up to $200 off Duct Cleaning
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$99 Furnace Tune-Up
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Breathing Easier Starts With a Look at the System
Book a visit before cedar season, and we will tell you what will actually help.
What Our Customers Say
Don't just take our word for it — hear from our satisfied customers
★★★★★
Our 18 year old HVAC system finally gave out this past week, so we reached out to Radiant to see what could be done. They sent a tech out named Bryan the same day, and he did a great job looking over the entire HVAC system. He was friendly and helpful in explaining everything that he saw, and our options moving forward. We decided to replace the entire system, so we met with Jacob (same day thankfully) to find the best HVAC system for our needs. Jacob was friendly, professional, and did a great job explaining the different options on offer. Radiant was able to set-up next day install, which was much appreciated, because the temps were still going to be cold in the coming days.
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
The install team consisted of Carlos and Pablo, who were very courteous and professional, and were kind enough to answer any questions I had regarding the install. They did a great job installing our new HVAC system, and were tidy which is always appreciated! Before they left, they explained everything that had been done, and showed me photos of the work.
Our entire experience from start to finish was great. I appreciate that they send photos of who is coming to your home too. Friendly, kind, professional team members, and good work all the way around. Thanks Radiant!
★★★★★
This is the first time I’ve used radiant my neighbor recommended them…. I called them today and they set me up an appointment on the same day. I was totally shocked at that and the service call was only $39!!…. Highly recommend them Danielle showed up and he was a great guy and he put up with all my wishy-washiness and I had to hurry him because I was heading to church and he got caught in a lot of traffic getting here he even would’ve installed the part that broke but I Didn’t have the time tonight….. He was patient with me and just told me to call the office first thing in the morning and get a service call set up…. Thank you so much Radiant!!….
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
With another cold front coming in tomorrow now I just hope they can get me scheduled for a separate call tomorrow but I have a feeling they will. They are such a great company!!😊😊
★★★★★
Alex performed the winter service on my unit. This business along with Alex, are very professional and upfront about everything. To be transparent, this is the maintenance included with the purchase of a unit from them. I was informed about everything to include pictures as proof. I was told that my unit is 100% and very clean and again pictures to prove it. I was reccomended this business by a friend and glad he did. The initial purchase experience was also amazing. I had contacted 5 other businesses to get quotes about a new unit as my upstairs unit failed. 2 were outrageous quotes and I am technically still waiting on the other 3. On every instance of getting a quote, I waited about 1 week. Luckily my house has two units but still, un acceptable especially during the summer. I guess they all had so much business they did not care for mine. When I called this business not only did they come out the same day, I had the new unit installed with in 48 hrs. Oh and let's not forget the quote they gave me was the lowest of all. I can say enough good things about this business. Keep up the great work.
Maintenance Membership
Join the Care Club
Home maintenance for $9.99 a month.
Care Club members get two HVAC tune-ups and a plumbing safety inspection every year, priority scheduling, no dispatch fees — ever — and 5% off every repair.
- Priority scheduling
- Seasonal HVAC tune-ups
- Annual safety inspection
- Exclusive member discounts
- Free dispatch on repairs
- No long-term contracts
San Antonio Indoor Air Quality Questions
What is the single best thing I can do about cedar fever in my San Antonio home?
Upgrade the filtration and run the system fan more. Mountain cedar pollen is small, and a standard one-inch fiberglass filter catches very little of it. A thicker pleated media filter in a properly sized cabinet, or a whole-house filtration unit at the air handler, catches far more, and running the fan on a schedule keeps air passing through it even when the house does not need cooling or heating. The second step is sealing duct leaks so the system stops pulling attic air around the filter entirely. Purifiers help with what filtration misses, but filtration comes first. Change filters more often from December through February; cedar loads them fast.
Should I add a dehumidifier or just run the AC more?
In San Antonio the honest answer is often both, but for different times of year. During the peak of summer a correctly sized air conditioner removes a lot of moisture as a byproduct of cooling. The trouble comes in spring and fall, on humid days in the 70s and 80s when the AC barely runs, and in tightly built homes where an oversized unit cycles off before it dries the air. A whole-home dehumidifier ducted into the system handles those hours, holding indoor humidity in a healthy range without overcooling the house. If your home feels clammy at 74 or you see condensation on windows, that is the sign. Details are on our dehumidifiers page.
Is a UV light in the air handler worth it here?
It can be, for a specific problem. A UV lamp mounted at the evaporator coil keeps biological growth from forming on the wet coil and in the drain pan, which is a real issue in San Antonio humidity and the usual source of a musty smell when the system starts. What it does not do is remove dust, pollen or pet dander from the air; those need filtration. So a UV light is a good addition when the complaint is odor or repeated coil and drain problems, and a poor substitute when the complaint is allergies. We will tell you which one you have. Our air scrubbers page covers the purification options that treat the air itself.
My new Alamo Ranch house feels stuffy. Is the air actually worse in a new home?
Often, yes, for a while. New construction is built tight, which is great for cooling bills but means very little fresh air gets in unless it is brought in on purpose. Add construction dust in the ducts and new materials releasing odors, and a new house can feel stale for its first year or two. The fixes are a duct inspection and cleaning if the runs are loaded, a controlled fresh-air ventilation system that brings outside air through the filter in measured amounts, and humidity control, because tight homes hold moisture as well as air. Our San Antonio duct cleaning page covers the first step.
*Offers cannot be combined with other promotions or applied to dispatch fees. No cash value. Must present offer at time of service. Call for details.
