In Central Texas, "indoor air quality" usually comes down to three things: filtration (dust, pollen and the cedar season that hits the Hill Country every winter), humidity, and fresh air. Your HVAC system affects all three. Requests sent through this site go to an independent contractor licensed by the Texas Department of Licensing and Regulation (TDLR).
Filtration
Filters are rated on the MERV scale. Higher MERV filters capture smaller particles such as pollen and fine dust, but they can also restrict airflow if the return isn't sized for them. That can reduce cooling performance and, in extreme cases, freeze the coil.
- A thin, high-MERV filter jammed into a small return is a common cause of airflow problems.
- A media filter cabinet (typically 4 to 5 inches deep) gives more surface area, so you can filter better with less restriction.
- Whatever you use, change it on schedule. A clogged cheap filter is worse than a clean one.
A contractor can measure static pressure to tell whether your system can handle a better filter.
Humidity
An air conditioner removes moisture as it cools. Problems show up when it can't:
- Oversized systems cool the house quickly and shut off before removing enough moisture, leaving the air clammy.
- Thermostats set to fan "On" can re-evaporate moisture from the coil back into the house. "Auto" is usually better for humidity.
- Whole-home dehumidifiers can help in tight or shaded homes, or where the AC runs less in spring and fall.
Signs of excess humidity include condensation on windows or vents, musty smells, and a sticky feel even when the temperature is right.
Ventilation
Newer, tighter homes can benefit from controlled fresh air through an ERV or a fresh-air intake with proper controls. Ventilation in a humid climate must be designed carefully so you don't bring in more moisture than the system can handle.
Air cleaners and UV lights
Electronic air cleaners, UV lights on the coil, and other add-ons are widely sold. Evidence for health benefits varies by product. If you're considering one, ask what problem it solves, what maintenance it needs (bulbs, cleaning), and whether the product produces ozone. The EPA's guide to air cleaners and filters is a useful neutral reference.
Ducts matter too
Leaky return ducts in a hot attic pull in dusty, humid attic air. Sealing ducts often does more for air quality than gadgets. See ductwork repair and air duct cleaning.
How a request works
Tell us what you're noticing: dust, allergies, odors or humidity. We'll forward your request to an independent licensed contractor serving your town.
Indoor Air Quality & Filtration FAQs
What MERV filter should I use?
Higher MERV catches more but can restrict airflow on small returns. A contractor can measure static pressure, or add a media filter cabinet for better filtration with less restriction.
Will a better filter help with cedar fever?
Better filtration can reduce pollen indoors, but it won't remove all exposure. Keep windows closed during peak pollen and change filters often.
Why does my house feel clammy even when it's cool?
Common reasons are an oversized system, the thermostat fan set to On, or air leaks. A dehumidifier or system adjustments can help.
Do UV lights and air purifiers work?
Results vary by product. Ask what specific problem it solves, what maintenance it needs, and whether it produces ozone.
What's the cheapest IAQ upgrade?
Changing filters on schedule and sealing leaky return ducts in the attic often help the most for the least money.