Will Running Furnace Fan Help Humidity

As an avid runner and someone who values indoor air quality, I’ve often wondered about the impact of running the furnace fan on humidity levels. Many homeowners, especially those living in regions with harsh winters, are familiar with the struggle of maintaining comfortable humidity levels in their homes during the colder months. Let’s delve into the question: Will running the furnace fan help with humidity?

The Role of the Furnace Fan

The furnace fan, also known as the blower, is a crucial component of a home’s heating, ventilation, and air conditioning (HVAC) system. Its primary function is to circulate heated or cooled air throughout the home. In some HVAC systems, the fan can be set to run independently of the heating or cooling cycles. When the fan runs independently, it continuously circulates air, which can impact indoor humidity levels.

How Running the Furnace Fan Affects Humidity

When the furnace fan runs, it continually moves air throughout the home. This constant circulation can help to distribute moisture more evenly, potentially reducing the formation of humidity pockets in certain areas. Additionally, if your home has a humidifier as part of the HVAC system, running the furnace fan can help to distribute the moisture added by the humidifier, aiding in maintaining consistent humidity levels.

Considerations and Recommendations

While running the furnace fan can have a positive impact on humidity levels, it’s essential to consider a few factors. Firstly, the impact of running the fan on humidity will depend on the design and layout of your home, as well as the specific HVAC system you have. Additionally, running the fan constantly can lead to increased energy consumption, potentially resulting in higher utility bills.

It’s important to strike a balance. If you’re aiming to use the furnace fan to help with humidity, consider running it periodically rather than constantly. This can help maintain an optimal balance between humidity control and energy efficiency.


After digging into the question, it’s clear that running the furnace fan can indeed help with humidity levels in your home, especially when used strategically. By understanding the role of the fan and considering the layout of your home and energy usage, you can utilize this simple HVAC feature to enhance comfort during the colder months.