Houston averages 75% relative humidity. That’s not just uncomfortable — it creates real problems for your HVAC system if you don’t stay ahead of it.
How humidity affects your HVAC
- Condensate overload — Your AC removes moisture from the air. In Houston, that’s a LOT of water. Clogged condensate drains are the #1 service call we get.
- Mold growth — Moisture in ducts, on coils, and around the air handler creates perfect conditions for mold.
- System works harder — High humidity makes your AC run longer because it’s removing moisture AND cooling air.
- Musty smell — If your house smells musty when the AC runs, moisture is likely building up somewhere in the system.
- Water damage — A clogged drain can overflow and damage ceilings, walls, and flooring.
Signs of humidity problems
- Water dripping from the indoor unit or ceiling
- Musty or moldy smell when AC runs
- Condensation on windows or walls
- House feels clammy even though AC is running
- Visible mold around vents or air handler
What you can do
- Check your condensate drain monthly — Pour a cup of white vinegar down the drain line to prevent clogs.
- Change filters more often — Dirty filters make humidity worse by reducing airflow.
- Don’t set the thermostat too low — Setting it to 68° makes the system short-cycle and actually removes LESS humidity.
- Schedule maintenance — We clean the coils, clear the drain, and check for moisture issues.
- Consider a dehumidifier — For homes with persistent humidity issues, a whole-home dehumidifier can help.