The humid summers in Florissant and St. Charles, Missouri, can get muggy and uncomfortable. You change the thermostat to a ideal temperature. The air conditioning begins running automatically. But, even after your cooling system cycles, your home still feels humid and uncomfortable.
That’s not very comfortable.
It can be disappointing when the air conditioner seems to operate normally, yet your home doesn't actually feel pleasant. If your rooms feel humid but thermostat says cool, you're not alone. Many area homeowners have this problem.
Why is this? Temperature and humidity are two different things. A temperature only tells you how hot or cold the air is within the room. It doesn't measure the amount of moisture in the air. When moisture levels are very high, your home can feel much hotter than the thermostat indicates, due to indoor humidity problems.
In this guide, you'll learn how humidity affects your comfort, common reasons your home feels humid even when the temperature is correct and simple troubleshooting steps you can try to reduce humidity in your Florissant and St. Charles, Missouri, home. That way, you’ll know when you should contact experts like the team at B&B Heating, Cooling, Plumbing & Electrical for support.
Why a Home Can Feel Humid Even If the Temperature Is Cool
Your home's temperature is only part of what makes your house comfortable. Indoor humidity is an extremely important consideration. The majority of homes are typically more comfortable when indoor relative humidity is between 30% and 50%. When a home has high indoor humidity, the air feels warmer, denser and stickier—even if the actual air temperature is cool.
Excess moisture can also encourage dangerous mold growth, mildew, musty odors and other indoor air quality issues. That's why your house feels humid but the AC is running—your system may be lowering the temperature of the air without extracting enough moisture.
Reasons Your Home Feels Humid Even with the AC Running
Living in Florissant and St. Charles, Missouri, high humidity can be a challenge.
Many area homeowners deal with the same question: Why does my home feel so humid?
There could be multiple reasons. Identifying what's creating humidity problems is the best place to start toward resolving the problem.
Below are several common reasons for indoor humidity problems in Florissant and St. Charles, Missouri:
1. Oversized Air Conditioner
An AC unit that's too big for your home lowers the temperature in your home too quickly. The problem is an oversized AC often doesn’t reduce humidity effectively because it stops operating before completing a proper cooling cycle.
2. Dirty Air Filter
A dirty air filter restricts airflow throughout your HVAC system. This makes it challenging for your equipment to remove moisture while cooling your home.
3. Clogged Condensate Drain
Your air conditioning removes moisture from your home’s air and and then it drains from the equipment through a condensate line. If that drain becomes blocked, moisture can't drain from the system properly, contributing to higher indoor humidity.
4. Frozen Evaporator Coil
The evaporator coil pulls both heat and moisture from your home's indoor air. Dirt buildup on the coil limits its effectiveness and often requires professional AC repair services to fix.
5. Damaged Ductwork
Ductwork transports cool air throughout your house. Openings in ductwork can allow warm, humid air from attics, crawl spaces or other uninhabited areas into your HVAC system. This additional moisture makes it more challenging to maintain comfortable humidity levels.
6. Thermostat Fan Set to “On” Change to “Auto”
If your thermostat fan is set to "On" instead of "Auto", the blower keeps running after the cooling cycle is finished. This can circulate moisture collected on the evaporator coil back into your home instead of letting it to drain away.
7. Exceptionally Humid Weather
During the area’s very humid summers, your HVAC system has to operate more to remove moisture from the air. Even when your AC is operating correctly, sometimes your home feels muggy because outdoor humidity keeps entering your home through doors, windows and normal air leakage.
8. Aging Heating and Cooling Equipment
As HVAC systems wear out over time, they often become less capable at controlling humidity. HVAC maintenance enhances performance, boosts efficiency and helps find worn-out parts. Putting off regular air conditioning maintenance can limit performance, including your system's ability to reduce moisture.
What You Can Check Before Calling an HVAC Technician
If your home feels humid, there are a few simple things you can check before booking service. These DIY tips are easy ways to improve indoor comfort by helping your HVAC system remove moisture more effectively.
- Replace a dirty air filter. A clean HVAC air filter allows proper airflow, helping your system condition and dehumidify your home more efficiently.
- Make sure the thermostat fan is set to Auto. This allows moisture to leave the system after each cooling cycle instead of being sent back into your living spaces.
- Check to ensure your supply and return vents are open and unobstructed. Rugs or furniture over the vents or closed vents can reduce airflow throughout your home.
- Check for water around the indoor unit. Water by your AC equipment may signal a clogged condensate drain or another drainage issue.
- Pay attention to how your air conditioning should run. If the AC is short cycling or turning on and off repeatedly, or it seems to run constantly without cooling your home like it should, it's time to have the system inspected by a professional.
Even if your thermostat still says cool but house feels humid, do not try repairs with refrigerant, electrical components or internal HVAC parts. DIY repairs may be tempting, but these repairs require specialized training and should always be handled by a qualified HVAC technician.
Could You Benefit from a Whole-Home Dehumidifier?
If you have humidity in your house during summer or year-round moisture problems, a whole-home dehumidifier may be a good option. Compared with portable units that only remove humidity from one room or area, a whole-home dehumidifier connects to your HVAC system to control humidity throughout your entire house.
Just one of B&B Heating, Cooling, Plumbing & Electrical's indoor air quality solutions, a whole-home dehumidifier makes your home more comfortable while lowering the risk of mold, musty odors and excess moisture. It can be extremely beneficial for homes in humid climates or properties that continue to have humidity even with a properly functioning cooling system.
When It's Time to Book HVAC Service
Ongoing HVAC humidity issues often trace back to an hidden problem that needs professional repair. The technicians at B&B Heating, Cooling, Plumbing & Electrical will evaluate refrigerant charge, airflow, blower performance and evaporator coils to determine why your system isn't removing humidity effectively. They can also inspect ductwork, condensate drainage and overall system sizing to identify the root cause.
We also can get you on the schedule for a heating and cooling tune-up. Seasonal seasonal tune-ups help find small problems before they become major breakdowns. That's why B&B Heating, Cooling, Plumbing & Electrical offers an HVAC maintenance plan that makes regular inspections easy and affordable.
If simple troubleshooting doesn't fix the home’s humidity issues, trust B&B Heating, Cooling, Plumbing & Electrical for dependable HVAC service in Florissant and St. Charles, Missouri.
Schedule HVAC service online or call 314-668-8530 today to fix your indoor humidity issues once and for all.