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Humidity and Indoor Comfort in East Texas

In Tyler, comfort is about moisture as much as temperature. A house at a reasonable thermostat setting can still feel sticky if the air conditioner is not pulling enough humidity out of the air.

Reviewed October 22, 2026 · General information only; not engineering or legal advice

Why humidity matters

NOAA's climate normals place East Texas in a humid subtropical climate (NOAA NCEI U.S. Climate Normals). Humid air feels warmer and stickier. The U.S. EPA's indoor air quality guidance recommends keeping indoor humidity low enough to discourage mold and dust mites, generally below 60 percent and ideally in the 30 to 50 percent range (U.S. EPA, indoor air quality).

How an AC removes moisture

As warm air passes over the cold indoor coil, moisture condenses and drips into the drain pan, then out the condensate line. That only happens while the system runs long enough for the coil to get cold and stay wet. Short cycles do little drying.

Common causes of a clammy house

  • Oversized system: it cools fast, shuts off, and never runs long enough to dehumidify.
  • Fan set to ON: running the blower constantly can blow moisture from the wet coil back into the house. AUTO is usually better for humidity.
  • Leaky ducts: return leaks in a hot, humid attic pull moist air into the system.
  • Air leaks: outdoor air sneaking in around doors, windows and attic penetrations.
  • Moisture sources: long showers without exhaust fans, cooking without a hood vent, and drying clothes indoors.

Fixes that help

Mold and smells

Musty smells, condensation on vents or windows, and mildew in closets are signs humidity is too high. The EPA's mold guidance stresses controlling moisture as the key step (U.S. EPA, indoor air quality). Persistent condensation on ducts or vents can also point to missing duct insulation.

Measuring it

An inexpensive hygrometer shows indoor humidity. Check it in several rooms on a humid day with the AC running. If readings stay high, see ductwork and airflow and AC and heat pump replacement, and what shapes a replacement.

Related pages: ac & heat pump replacement, ductwork & airflow, hvac maintenance & tune-ups, and what shapes an estimate.

Sources: U.S. EPA, indoor air quality; ENERGY STAR, heating and cooling; U.S. Department of Energy, Energy Saver heating and cooling; NOAA NCEI U.S. Climate Normals.

Asked and answered

Short answers

  1. What indoor humidity is best?

    The EPA suggests keeping it below 60 percent, ideally 30 to 50 percent.

  2. Should my thermostat fan be ON or AUTO?

    AUTO usually removes more humidity, because moisture on the coil drains away between cycles.

  3. Can a bigger AC fix humidity?

    Often the opposite. An oversized system short-cycles and removes less moisture.

  4. Do I need a dehumidifier?

    If humidity stays high with a properly working, right-sized AC, a whole-home dehumidifier can help.

  1. AC & Heat Pump Replacement

    Replacing worn-out AC systems and heat pumps: load calculations, matched indoor and outdoor equipment, SEER2 efficiency, refrigerant changes and permits.

  2. Ductwork & Airflow

    Leaky, crushed or undersized attic ducts, weak airflow, hot rooms upstairs, returns, insulation and balancing.

  3. HVAC Maintenance & Tune-Ups

    Spring cooling and fall heating tune-ups: coils, drains, electrical parts, refrigerant checks, burners and safety controls.

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