Indoor air quality in older KC homes — what actually helps (and what is sales theater)

Three local factors stack:

• Pollen + mold load. KC's tree pollen season runs March–May and ragweed picks up in August. Mold spore counts climb after summer rain.
• Humidity swings. KC summers run high humidity, winters run dry. Older homes lack the envelope to buffer either.
• Aging duct systems. A 1960s ranch in Raytown or Shawnee often has metal trunk-and-branch ducts with degraded mastic, dust accumulation, and air leaks into unconditioned spaces — all of which act as a recirculation loop for indoor pollutants.

• Filter upgrade. Move from a basic 1-inch MERV 6 panel to a MERV 11 or 13 media cabinet. Captures dramatically more pollen and dust. Caveat: a high-MERV filter in a 1-inch slot a furnace wasn't designed for will choke airflow. A 4-inch media cabinet is the right way to upgrade.
• Duct sealing. Mastic-and-tape on accessible seams + new boots where they meet floor registers. A surprising amount of indoor air complaints trace to ducts pulling air in from a crawlspace or attic.
• Humidifier maintenance. If you already have a whole-home humidifier, clean the pad every season. Neglected pads grow bacteria and become a worse source of indoor air problems than the dry-air complaint they fix.

• UV light over the coil. A UV-C lamp mounted over the evaporator coil reduces biofilm + mold growth on the coil itself. Real effect on coil cleanliness; secondary effect on indoor air. Worth it in humid summer climates if you have a history of mold odor when the AC kicks on.
• Whole-home dehumidifier. If your AC short-cycles in summer and the house feels clammy at 76°F, a whole-home dehumidifier tied into the ductwork solves it. More effective than turning the thermostat down further.
• Active air purification (PCO / bipolar ionization). Mixed evidence in independent testing. Effective in some scenarios, marginal in others. We'll discuss it honestly when it makes sense and pass when it doesn't.

An ERV (Energy Recovery Ventilator) or HRV (Heat Recovery Ventilator) brings in measured outdoor air through a heat exchanger that pre-conditions it. This is the IAQ tier that's overlooked in older KC homes that have been air-sealed during remodels. Once a home is tight enough that opening a window changes the air noticeably, you should be conditioning the ventilation — not just hoping for it.

• "Magic" UV wand devices marketed for the supply duct. UV-C is real over the coil, where it has dwell time on a wet surface; in the supply duct the air moves through too fast for meaningful disinfection.
• "Ozone-generating" or "ionizing" plug-ins. Ozone is a respiratory irritant. We don't sell or install ozone-generating IAQ devices.
• Duct cleaning as a routine annual service. Worth it occasionally — after construction, after pest issues, on a home with visible debris. Not a recurring need on a properly filtered, properly maintained system.

If you have a specific IAQ complaint (dust, allergies, humidity, smell when the system kicks on), tell us the symptom and we'll walk through Tier 1 first. Book an IAQ assessment or browse our IAQ services.