The humid summers in Florissant and St. Charles, Missouri, can get muggy and uncomfortable. You change the thermostat to a comfortable temperature. The air conditioner kicks on automatically. But, even after your air conditioner cycles, your home still feels moist and clammy.
Now, you’re cool and damp.
It can be disappointing when the air conditioner seems to be doing its job, yet your home doesn't actually feel very comfortable. If your rooms feel humid but thermostat says cool, you're not alone. It happens a lot.
Why? Temperature and humidity are two different measurements in your home. A temperature only tells you how warm or cool the air is within your home. It doesn't measure how much humidity is in your home. When humidity levels are too high, your home can feel several degrees warmer than the thermostat indicates, due to indoor humidity problems.
In this guide, you'll learn how humidity affects your home comfort, common reasons your home feels humid even when the temperature is correct and basic troubleshooting steps you can try to reduce humidity in your Florissant and St. Charles, Missouri, home. That way, you’ll know when to reach out to experts like the team at B&B Heating, Cooling, Plumbing & Electrical for expert assistance.
Why Your Home Can Feel Humid Even If the Temperature Is Cool
Your home's temperature is only part of what makes your home pleasant. Indoor humidity is another important factor. Many homes are typically more comfortable when indoor relative humidity stays in the 30-50% range. When a home has high indoor humidity, the air feels less comfortable, more oppressive and stickier—even if the actual air temperature is cool.
High humidity can also promote dangerous mold growth, mildew, bad smells and other indoor air quality issues. That's why your house feels humid but the AC is running—your system may be cooling the air without extracting enough moisture.
Reasons Your Home Feels Humid Even with the AC Running
Making your home in Florissant and St. Charles, Missouri, excess moisture can be a frequent concern.
Plenty of area homeowners ask the same question: Why does my house feel humid?
There are several common causes. Identifying what's creating high idoor humidity is a good first step toward fixing the problem.
Here are several common reasons for indoor humidity problems in Florissant and St. Charles, Missouri:
AC is Too Large
1. Oversized Air Conditioner
An AC that's bigger than your home needs 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 full cooling cycle.
2. Dirty Air Filter
A clogged air filter limits airflow throughout your HVAC system. This makes it more difficult for your equipment to control humidity while cooling your home.
3. Obstructed Condensate Drain
Your AC removes moisture from your home’s air and drains it outside through a condensate line. If that drain becomes clogged, moisture can't drain from the system properly, contributing to increased humidity levels.
4. Icy Evaporator Coil
The evaporator coil extracts both heat and moisture from your home's air. Ice formation or excessive dirt on the coil reduces its effectiveness and often requires professional AC repair services to restore performance.
5. Leaky Ductwork
Ductwork carries cool air throughout your house. Openings in ductwork can pull warm, humid air from attics, crawl spaces or other unused areas into your HVAC system. This additional moisture makes it more challenging to maintain comfortable humidity levels.
6. Thermostat Fan Running on “On” Change to “Auto”
If your thermostat fan is set to "On" instead of "Auto", the blower continues to operate after the cooling cycle completes. This can blow moisture collected on the evaporator coil back into your home instead of allowing it to drain away.
7. Unusually Humid Weather
During the area’s very humid summers, your HVAC system has to run longer to remove moisture from the air. Even when your air conditioner is working properly, sometimes your home feels muggy because outdoor humidity continually enters your home through doors, windows and normal air leakage.
8. Older HVAC Equipment
As home comfort systems get older, they often become less capable at controlling humidity. HVAC maintenance enhances performance, increases efficiency and helps detect worn-out parts. Skipping regular air conditioning maintenance can decrease performance, including your system's ability to reduce moisture.
Things to Check Before Scheduling an HVAC Technician
If your house 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 heating and cooling system remove moisture more effectively.
- Replace a dirty air filter. A clean heating and cooling system air filter allows proper airflow, helping your system condition and dehumidify your home more efficiently.
- Verify the thermostat fan is set to Auto. This allows moisture to leave the system after each cooling cycle instead of being circulated back into your living spaces.
- Check to ensure your supply and return vents are open and unobstructed. Furniture over the vents or closed vents can restrict airflow throughout your home.
- Check for water around the indoor unit. Water by your AC equipment may indicate a clogged condensate drain or another drainage-related issue.
- Know how your air conditioning should run. If the AC is short cycling or turning on and off frequently, or it seems to run constantly without improving comfort, it's time to have the system evaluated by a professional.
Even if your thermostat still says cool but house feels humid, do not perform repairs involving refrigerant, electrical components or system components. DIY repairs may be tempting, but these repairs require advanced training and should always be left to a qualified HVAC technician.
Should You Get a Whole-Home Dehumidifier?
If you struggle with humidity in your house during summer or year-round moisture problems, a whole-home dehumidifier may be worth considering. Unlike portable units that only remove humidity from one room or area, a whole-home dehumidifier works with your HVAC system to reduce humidity throughout your entire house.
Just one of B&B Heating, Cooling, Plumbing & Electrical's indoor air quality solutions, a whole-home dehumidifier helps keep your home more comfortable while lowering the risk of mold, musty odors and excess moisture. It can be extremely beneficial for homes in humid areas or properties that still have humidity even with a properly functioning cooling system.
Signs It's Time to Request HVAC Service
Ongoing HVAC humidity issues often point to an hidden problem that needs professional repair. The technicians at B&B Heating, Cooling, Plumbing & Electrical will check refrigerant charge, airflow, blower performance and evaporator coils to identify why your system isn't managing humidity effectively. They can also evaluate 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. Regular seasonal tune-ups help identify small problems before they become complicated, costly repairs. That's why B&B Heating, Cooling, Plumbing & Electrical offers an HVAC maintenance plan that makes regular inspections cost-effective and hassle-free.
If basic troubleshooting doesn't solve 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 restore your comfort.