Your thermostat says 71°F, but your home still feels sticky and uncomfortable. If you’ve ever lowered the temperature only to find that the air still feels humid, you’re not imagining it. Air temperature and humidity work together to determine how comfortable your home actually feels. Even if your thermostat displays 71°F, high humidity can make it feel much warmer.
Humidity Matters Just as Much as Temperature
Air conditioners are designed to cool your home while removing moisture from the air. However, if excess humidity remains indoors, your home can still feel uncomfortable. High indoor humidity can also contribute to musty odors, condensation on windows, and reduced comfort throughout the house.
Leaky Ductwork Can Be a Hidden Cause
One of the most overlooked causes of indoor humidity is leaking ductwork. Many HVAC ducts run through unconditioned spaces such as attics, crawl spaces, and garages. During the summer, attic temperatures can exceed 140–150°F. If return ducts or supply ducts have leaks, they can pull in or mix with extremely hot, humid air from these spaces.
When your air conditioner has to cool air that is already much hotter and contains more moisture, it has to work significantly harder. The system spends more time trying to lower the temperature and has less capacity to remove humidity effectively, leaving your home feeling damp even though the thermostat has reached the set temperature.
Other Reasons Your Home Feels Humid
- Dirty air filters restricting airflow
- An oversized or undersized air conditioner
- Dirty evaporator coils
- High outdoor humidity
- Poor attic or crawl space insulation
- Inadequate ventilation
How Professional Duct Sealing Can Help
Professional duct sealing, including Aeroseal®, seals leaks from inside the duct system. Properly sealed ducts help prevent hot, humid attic or crawl space air from entering the HVAC system, improve airflow, increase comfort, and can reduce energy waste.
Trust Advanced Furnace & Air Duct Cleaning
Since 1964, Advanced Furnace & Air Duct Cleaning has helped homeowners improve indoor comfort and HVAC performance. Our team can inspect your ductwork for leaks, evaluate airflow, and recommend professional air duct cleaning or Aeroseal® duct sealing when appropriate.
If your home feels humid even while the AC is running, don’t assume the air conditioner is the problem. Your ductwork may be costing you comfort and efficiency. Contact Advanced Furnace & Air Duct Cleaning to schedule a professional HVAC and duct inspection.