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The Ideal Summer Home Temperature for Mold Prevention in Wisconsin and Illinois

Updated: Jul 26

As summer heats up in the Midwest, homeowners in Wisconsin and Illinois face the dual challenges of keeping cool and combating mold growth. Mold thrives in warm, moist environments, and the combination of high humidity and indoor cooling systems can create perfect conditions for mold to flourish. To maintain a comfortable and healthy home environment during the summer months, it's essential to manage indoor temperatures and humidity levels effectively. Here’s how to do just that:


Understanding Mold and Its Ideal Conditions

Mold spores are always present in the air, but they only grow into mold when they find the right conditions: warmth, moisture, and a food source like wood or drywall. Mold growth is not only unsightly and damaging to your home, but it can also pose health risks, especially to those with allergies or respiratory issues. To prevent mold growth, it's crucial to control these environmental factors, particularly temperature and humidity.


Setting the thermostat to prevent mold growth in the summer in the midwest.

Optimal Summer Temperatures

The ideal temperature to keep your home in the summer to prevent mold growth is generally between 68°F and 78°F (20°C to 25.5°C). This range is cool enough to slow mold growth significantly and warm enough to prevent the air from becoming too moist, which can happen if the air conditioner is set too cold.


Managing Humidity

Humidity control is equally important. The ideal indoor humidity level to prevent mold is between 30% and 50%. In the humid summers of Wisconsin and Illinois, this often requires the use of dehumidifiers in conjunction with air conditioning. Air conditioners remove some moisture from the air, but in extremely humid conditions, they may not be sufficient on their own.


Tips for Effective Temperature and Humidity Management

1. Use a Programmable Thermostat: Set your thermostat to higher temperatures when you’re not home and cooler temperatures when you are home. This strategy helps in managing energy costs while preventing the indoor temperature from getting too high, which could foster mold growth.

2. Invest in a Dehumidifier: A dehumidifier can be particularly effective in basements and other areas prone to dampness. This device helps maintain an optimal humidity level, thus inhibiting mold growth.

3. Ensure Proper Ventilation: Use exhaust fans in the kitchen, bathroom, and laundry areas. These spots are hot spots for moisture, and proper ventilation is key in preventing mold.

4. Regular Maintenance of HVAC Systems: Clean and replace air conditioner filters regularly to ensure the system is efficient at humidity control. Ensure that your air conditioning unit is the right size for your space; an oversized unit will cool too quickly without adequately dehumidifying the air, and an undersized unit may not cool effectively.

5. Monitor Humidity Levels: An indoor hygrometer can help you keep an eye on humidity levels. These devices are inexpensive and can provide a quick readout of the current humidity, helping you to take action if levels get too high.


By maintaining the right temperature and humidity levels in your home during the summer, you can create a more comfortable living environment while significantly reducing the risk of mold growth. This not only protects the structural integrity of your home but also promotes a healthier indoor atmosphere for you and your family. Stay cool and mold-free this summer with these proactive steps!


In case mold does sneak into your home and get the best of you, be sure to give us a call 1-877-680-5489!

We're here to help you maintain a safe, healthy, and structurally sound home.



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We have offices in Brookfield and Madison, Wisconsin, St. Paul, Minnesota, and Palatine, Illinois.

Not sure which location servers your area? Call us today at 877-680-5489

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