How To Turn On Furnace Fan Without Heat [3 Easy Steps]

Turning the furnace fan on without heat is very easy if you know the right method. You just have to set the furnace’s fan setting to “Auto”. 

But arranging this setting can be a tricky task. And turning the furnace fan to auto can lead to other conditions as well.

However, you don’t have to worry about any of these because, in this article, we will discuss how to turn on furnace fan without heat and what this can do to your furnace. 

Let’s get to it.

How To Turn On Furnace Fan Without Heat [3 Easy Steps]

As mentioned earlier, setting the furnace fan to auto will allow running the furnace fan only. But how do you do it? Here are the 3 simple steps of that setting:

Step 1: Locate The Fan Switch

The first thing you need to do is locate the fan switch. This switch is located on the thermostat control. There will be different types of dials designated for different purposes. You have to be careful while selecting the fan switch.

Step 2: Turning The Fan Switch

Now you have to turn the fan switch. You will see two options available there, “ON” and “AUTO”. Select the “AUTO” setting.

Step 3: Turning The Heat Switch

Now you have to work with the “Selector Switch”. It is known as the temperature setting switch as well. You will find three options available there, “COOL”, “OFF”, and “HEAT”. As your goal is running the furnace fan only, set this setting to “OFF”. 

However, if you want to make a furnace fan run in summer, you can switch to “COOL”.

Note: Many furnace models have the “Fan Only” option. If your furnace has this feature, then it will be sufficient. You will not have to set the furnace fan to “Auto” in this case.

Now see if the furnace is running properly. It should not have any problem if the whole device is okay. 

5 Benefits of Setting Your Furnace Fan To Auto

Turning the furnace fan to auto will surely allow your furnace fan to run without heat. But a lot more can happen if you set the furnace fan on auto or circulate it in summer. Though the effects are not necessarily detrimental, you should know about them. These are the major consequences of setting the furnace fan to auto:

1. Reduces Cost:

Setting the furnace fan to auto will save a lot of electricity and drastically reduce your electricity bill. Whereas manual setting takes more electricity to ensure utmost performance. Auto setting absorbs just the right amount.

2. Cool Environment:

The furnace fan will continuously refine the air in the room and keep the atmosphere dehumidified. Once the moisture escapes the room, the whole environment becomes cool almost instantly.

3. Furnace Longevity:

The auto setting of the furnace fan extends the durability of the furnace because there is no extra pressure on the furnace system.

4. Decay Of Blower Motor Fan:

As your furnace fan will constantly be moving, the blower motor fan will decay faster than usual. You may need to change it every 6 months.

5. Clogged Filter:

Due to its continuous function, the furnace filter will wear off very quickly. So you will have to get a new furnace filter every now and then. Keeping these 5 things in mind will definitely help you get the most out of your furnace fan set to auto.


Does turning on the furnace fan cool the house?

Yes, a furnace fan decreases the humidity and cools the environment.

Does the fan have to be on for the heater to work?

Yes, the fan needs to be on for the heater to function.

How do I know if my furnace blower motor is bad?

Symptoms of a bad furnace blower motor are poor airflow, too much electricity consumption, weird noises, overheating, and a strange stench.

Why is my furnace fan not turning on?

Your furnace fan may not turn on because of wiring issues, circuit issues, and an inconsistent supply of electricity.

Why is my furnace running but not blowing hot air?

Clogged dirt and debris are the main culprits behind such an issue.

Why my furnace control board is not lighting up?

Your furnace control board is not lighting up due to some common issues such as an inadequate supply of gas or electricity, defective wiring, or broken light in the control board, etc.

To Conclude:

Turning on the furnace fan with no heat can bring a relaxing ambiance to your room. And now that you know how to turn on a furnace fan without heat, doing such modification shouldn’t be difficult at all. 

However, if you have any questions, you can ask them in the comment section below.

About William

William is the founder of He has real life practical skills in fixing smoker & heating appliance issues. He loves to share his knowledge & helps others in fixing their appliances & saving their money. William firmly believes that anyone can repair his or her unit with the correct guidance & knowledge. See more at about us.

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