Indoor Air Quality for Florida Homes
Gulf Coast humidity does something to a home that dry climates do not: it keeps every surface inside your ductwork damp enough to grow things. Combine that with houses sealed tight against the heat for nine months a year, and indoor air here is routinely worse than the air outside. Purity Air Services treats the cause -- moisture, filtration, and ventilation -- rather than selling you a plug-in gadget.
Indoor Air Quality
What we handle
Air duct cleaning
Florida ductwork accumulates dust, construction debris, and -- in humid attics -- microbial growth. If you can see dust discharging from the supply registers, smell a musty odor when the system kicks on, or have allergy symptoms that improve when you leave the house, the ducts are worth inspecting.
Duct sealing and repair
Leaky returns in a hot attic pull 130°F air into your system and drive your bill up while never quite cooling the house. Sealing the distribution system is one of the highest-return improvements available in a Florida home, and it usually costs far less than replacing equipment.
Whole-home dehumidification
The comfort target here is not just temperature -- it is holding indoor relative humidity between 45 and 55 percent. A dedicated dehumidifier lets you do that without overcooling the house to 70°F to get the moisture out, which is what most Florida homeowners end up doing by default.
UV light purification
UV-C lamps installed at the evaporator coil keep mold and biological growth off the wet coil surface where it otherwise takes hold. This is the single most useful UV application in a humid climate -- it keeps the coil clean, which also protects airflow and efficiency.
Filtration upgrades
A one-inch fiberglass filter protects the equipment, not your lungs. Upgrading to a properly sized media filter captures far more pollen, dust, and dander -- but only if the system can handle the added static pressure, which we verify before recommending it.
Air quality assessment
We measure temperature, relative humidity, and airflow at the registers, inspect the ductwork and coil, and tell you which of the above will actually change your air. Sometimes the answer is a $200 drain treatment rather than a $3,000 system.
Service area
Indoor Air Quality across Sarasota & Manatee County
We cover Sarasota County and Manatee County, from the barrier islands to Parrish and Lakewood Ranch.
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Other services
AC Repair
Same-day diagnostics and repair when your system stops cooling. Upfront pricing, no overtime charges on evenings or weekends.
AC Installation & Replacement
Free in-home estimates and properly sized replacements. We run a Manual J load calculation on every install, not a guess based on the old unit.
Maintenance Plans
Two tune-ups a year, priority scheduling, and repair discounts from $12.95/mo. Catch problems in April instead of during an August heat wave.
Answers
Indoor Air Quality questions
How often do air ducts need cleaning?
There is no fixed schedule -- clean ducts when there is a reason to. Visible dust discharge from registers, a musty smell when the system starts, recent renovation work, or evidence of a rodent or moisture intrusion are all genuine reasons. Routine cleaning on a timer for a clean, sealed system is not necessary.
What indoor humidity should I target in Florida?
Between 45 and 55 percent relative humidity. Above 60 percent you get mold and dust mite growth. If you are running the thermostat down to 70°F just to feel comfortable, you have a humidity problem rather than a temperature problem, and a dehumidifier will fix it for less than the extra cooling costs.
Do UV lights actually work?
At the evaporator coil, yes -- they are effective at preventing biological growth on the wet coil surface, which in this climate is a real and recurring problem. Claims about UV sterilizing the air as it rushes past in the duct are far weaker, because contact time is too short. We install them where they do something.
Will duct sealing lower my power bill?
Usually, and often meaningfully. Duct leakage in an unconditioned Florida attic commonly wastes 20 to 30 percent of the cooling you have paid to produce. We test before and after so you can see what changed.
My house smells musty when the AC turns on. Why?
Most often it is biological growth on the evaporator coil or standing water in the drain pan -- both very common here. Coil sanitization and drain treatment usually solve it, and a UV lamp at the coil keeps it from returning.
What filter should I use?
For most homes a MERV 8 to 11 media filter is the right balance of filtration and airflow. Higher MERV ratings filter more but restrict airflow, and on a system that was not designed for the added static pressure that can freeze the coil and strain the blower. We check your system's static pressure before recommending an upgrade.
AC trouble? We can usually be there today.
Book online in under a minute, or call and talk to a real person. Upfront pricing on every job, and no overtime charges nights or weekends.