Allergies Worse Indoors?

If your eyes itch, your nose runs, and your chest tightens up the second you walk into your own house, you are not imagining it. Tampa Bay homes are loaded with indoor air quality problems that most homeowners never see, and after running service calls across Hillsborough, Pinellas, and Pasco for years, we run into the same handful of culprits over and over again.

The first one is mold growth right on your AC evaporator coil. That coil sits wet for most of the year because we run cooling roughly nine months out of twelve here. Year round condensation plus a dirty coil surface gives mold spores a perfect food source, and every time the blower kicks on, those spores get pushed right into your living room.

Second is leaky return ductwork. A return duct runs through your attic at 130 degrees and pulls in any air it can find through gaps, joint failures, or a torn boot. That means attic insulation fibers, wood dust, rodent droppings, and outdoor pollen all get sucked into the system and blown back at your family. We see this on at least half the homes we walk into.

Third is dust mites. They explode in population once your indoor humidity climbs above 60 percent, which is exactly where most Tampa homes sit when the AC is undersized or the dehumidification is weak. Fourth is old R-4 flex duct shedding fiberglass particles from its inner liner as it gets brittle with age. Fifth is a basic MERV 8 filter that lets fine particulate sail right through. Sixth is no UV light treatment on the coil, which means whatever lands on that wet metal grows. And seventh is a coil that has not been cleaned in years and has built up a biofilm layer that bacteria and mold colonize. Stack two or three of these together and that is why your allergies act up the moment you cross the threshold.

Once we know which issues you have, here is how the fixes stack up in terms of effectiveness per dollar for a Tampa Bay home. A Halo-LED UV light installed at the coil runs roughly 695 to 995 dollars installed and kills mold and bacteria where they actually grow, on the wet aluminum surface of the evaporator. This is the single highest impact upgrade for most allergy sufferers in our climate.

Upgrading from a MERV 8 filter to MERV 13 runs about 145 to 285 dollars depending on whether your return grille needs to be enlarged to handle the higher resistance. MERV 13 captures fine particles in the 0.3 to 1 micron range that pass straight through standard filters.

A whole home dehumidifier such as the Aprilaire E100 or E130 runs 1,995 to 3,995 dollars installed. If your indoor RH will not stay below 55 percent during the summer, this is the fix that drops dust mite populations and mold pressure all on its own.

NADCA-certified duct cleaning with sanitizing runs 495 to 1,495 dollars depending on the system size and condition. Return duct sealing to stop attic air infiltration runs 295 to 895 dollars. Coil cleaning with a biocide rinse runs 295 to 495 dollars. A whole home HEPA bypass filtration system at the AC runs 1,295 to 2,495 dollars.

The most effective stack for a typical Tampa allergy sufferer is the combination of UV light at the coil, MERV 13 filtration, and a whole home dehumidifier. Together, those three deliver roughly an 80 percent reduction in mold and dust mite triggers based on what we see in follow-up customer feedback. We give FREE estimates on every IAQ package, and you can mix and match based on what your diagnosis actually shows. Call (813) 343-2212 and we will come look at your setup.