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How To Change Blower Speed On Furnace

How to change blower speed on furnace Trane XB 2018 YouTube
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If you’re experiencing issues with your furnace’s blower speed, you may need to make some adjustments. The blower speed affects the airflow and temperature in your home, so it’s important to ensure it’s set correctly. In this article, we will guide you through the process of changing the blower speed on your furnace.

Step 1: Turn off the Power

Before making any changes to your furnace, it’s crucial to turn off the power. Locate the electrical disconnect switch near your furnace and switch it off. This will ensure your safety while working on the blower speed adjustment.

Step 2: Access the Blower Motor

Next, you’ll need to access the blower motor. Depending on your furnace model, it may be located behind a removable panel or within a separate compartment. Refer to your furnace’s manual for specific instructions on accessing the blower motor.

Step 3: Locate the Speed Control Switch

Once you have access to the blower motor, locate the speed control switch. This switch is typically located on the side of the blower motor and may have different speed settings labeled, such as low, medium, and high.

Step 4: Adjust the Speed Control Switch

Using a small screwdriver or a similar tool, carefully adjust the speed control switch to your desired setting. Start by setting it to the lowest speed and observe the blower fan’s performance. If it’s too slow or not providing enough airflow, gradually increase the speed until you find the optimal setting.

Step 5: Test the Blower Speed

After making the adjustment, turn on the power to your furnace and test the blower speed. Monitor the airflow and temperature in your home to ensure it’s functioning correctly. If necessary, make further adjustments until you achieve the desired blower speed.

Tips for Changing Blower Speed

1. Consult the Furnace Manual

Always refer to your furnace’s manual for specific instructions and safety guidelines. Different furnace models may have unique procedures for changing the blower speed.

2. Gradual Adjustments

When adjusting the blower speed, make small and gradual changes to avoid sudden airflow disruptions. This will help you find the optimal setting without causing any issues.

3. Regular Maintenance

To ensure your furnace operates efficiently, perform regular maintenance such as cleaning or replacing air filters. A clean furnace and blower motor can help maintain proper airflow and prevent speed issues.


Changing the blower speed on your furnace is a simple process that can significantly impact your home’s comfort. By following these steps and considering the tips provided, you can easily adjust the blower speed to suit your needs. However, if you encounter any difficulties or are unsure about making the changes yourself, it’s recommended to consult a professional HVAC technician to avoid any potential damage to your furnace.