How Can You Use Your Air Conditioner to Lower Humidity?

How to use your AC for optimal indoor humidity and air quality control

Right AC fan setting

Change the filters regularly

Ensure clean AC coils

Proper refrigerant levels

Incorporate a thermal expansion valve

 Dehumidifier in tandem with your AC

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How can you use your air conditioner to lower humidity?
Facts & Stats • 91 Days ago

How to use your AC for optimal indoor humidity and air quality control

Maintaining the ideal indoor humidity level between 30% and 50% is essential for a healthy and comfortable home environment. Excess humidity, especially when it exceeds 70%, can foster conditions that support the growth of dust mites, mold, and mildew—triggers that can aggravate allergies and asthma. Summer's high heat and humidity often challenge this balance, but fortunately, your air conditioner does more than just cool the air; it plays a crucial role in regulating indoor humidity levels. By effectively lowering humidity, your AC helps prevent issues like musty odors and potential structural damage, which can negatively impact indoor air quality. Understanding how air conditioning contributes to humidity control and implementing strategies to maintain optimal indoor air quality can greatly enhance your home's comfort and health.


Right AC fan setting


To improve air quality and control humidity, set your AC fan to "Auto." When set to "On," the fan continually circulates air, blowing moisture from the evaporator coils back into your home, which can increase humidity and promote mold growth. Setting the fan to "Auto" ensures it only runs when the compressor is active, allowing moisture to drain properly and reducing indoor humidity.

Reducing your AC fan speed enhances moisture removal. While higher speeds quickly circulate cooler air, they don’t effectively control humidity. Slower airflow keeps the coils colder, allowing for better moisture extraction and consistent temperature. Adjusting the fan speed can improve both comfort and efficiency.

These simple adjustments—setting the fan to "Auto" and lowering the fan speed—not only enhance comfort but also contribute to better indoor air quality by reducing humidity levels.


Change the filters regularly


Regularly changing your air filter is key to maintaining good indoor air quality. A clogged filter can trap dust and moisture, leading to higher indoor humidity and potential mold growth. To prevent these issues and keep your air quality high, replace or clean the filter about once a month or as recommended by the manufacturer. This simple step helps ensure effective moisture control and a healthier home environment.


Ensure clean AC coils


Ensuring your AC coil is clean is vital for maintaining high indoor air quality. A dirty evaporator coil struggles to cool and dehumidify effectively, leading to higher indoor humidity and less efficient temperature control. If your AC isn't reaching the desired temperature, it's a good idea to have our HVAC specialists inspect and clean the coils. Often, dirty coils are a result of a clogged filter, which allows dust and debris to enter the system and accumulate on the coils. Regular professional AC coil cleaning helps maintain optimal performance and improves indoor air quality by ensuring better humidity control and cooling efficiency.

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Proper refrigerant levels


Keeping the refrigerant charge in your air conditioner at the correct level is essential for humidity control and maintaining good indoor air quality. Low refrigerant can reduce cooling efficiency, leading to issues like a frozen evaporator coil or compressor failure. To avoid these problems and ensure your system operates efficiently, have regular HVAC maintenance to check and recharge the refrigerant as needed.


Incorporate a thermal expansion valve


A thermal expansion valve (TXV) boosts humidity control by precisely regulating refrigerant flow based on temperature. This improves the evaporator coil’s efficiency in removing heat and moisture. When combined with a variable blower motor that adjusts fan speed, the TXV enhances cooling and dehumidifying performance, contributing to better indoor air quality.


 Dehumidifier in tandem with your AC


Combining your air conditioner with a dehumidification system can greatly reduce humidity levels in your home. Installing a whole-house dehumidifier allows your AC to work more efficiently, as it doesn't need to handle as much moisture on its own. This setup not only enhances comfort but also saves money by reducing the strain on your air conditioner. On milder days, the dehumidifier can operate independently, further maintaining optimal indoor air quality without needing to cool the space.


If you're dealing with high indoor humidity and mold growth, The Healthy Home®’s inspection and mold remediation services are here to help. Our experts will thoroughly inspect and address all potential mold hotspots, from kitchen and bathroom corners to your AC ducts. Since humidity and moisture are key factors in mold development, staying proactive is crucial. In addition to mold removal, we offer precise mold testing for both residential and commercial properties.


Regular AC servicing is vital, ideally once or twice a year before the summer, to ensure your system is ready for increased usage and effective humidity control. Our comprehensive air conditioning services, including maintenance, cleaning, and repair, help identify and resolve issues, optimize performance, and enhance your cooling system's efficiency. By maintaining proper humidity control, we improve indoor air quality, ensuring you and your family breathe easier and live healthier.

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