Using a Vent for an Air Conditioner/Heater

What You'll Need
An air conditioning unit
A vent attached to the unit
A thermometer, preferably one that can read humidity

Since their advent, air conditioner heaters have become a normal part of our everyday human lives. Controlling the air flow of these great devices can sometimes be tricky but with this guide you will find some of the best ways to use your air conditioner/heater vent. This guide will show you when and how to open and close your vent to provide optimal heat or air conditioning, depending on what you are looking for.

Step 1 - Assessing the Air Outside

Let’s assume, for this step, that you’re using the air conditioner. The temperature and humidity outside will greatly affect whether or not you should open your vent. If the air outside is above eighty degrees Fahrenheit and either really dry or really humid then it is best to leave your vent closed. Opening it at this stage could totally defeat the purpose of your air conditioning unit by letting warm, muggy air inside while you want cold air. If you are attempting to heat a room instead of cooling the room then it is the same basic principle, only in reverse. If the weather outside is cooler than your desired indoor temperature then close the vent so as to prevent the unwanted entry of cold air and to help trap the hot air inside for better recirculation.

Step 2 - Set the Air Conditioner/Heater

Once you have a rough idea of the temperature outside you can properly compare it to your ideal inside temperature. Now it is time to set your air conditioning unit. To do so follow the specific controls and instructions provided by the manufacturer of your specific unit. You now have the knowledge needed to form an educated decision on whether or not the vent should be open. Open or close the vent accordingly before moving on to the next step in this simple process.

Step 3 - Assessing the Air Inside

Now that your air conditioning unit is set and the vent is open or closed accordingly it is time to assess the inside air. Is it still hotter/colder than you’d like? If so you may want to reassess what you’ve done so far and try the vent in the other position, if it’s open try closing it and vice versa. Leave the room for a good ten minutes before reentering and deciding whether or not this has helped.


  • If you can’t seem to get the right temperature, don’t be afraid to play around and try different settings in different combinations. Eventually you’ll find the perfect setting to fit your tastes.
  • If your room or house smells opening the vent is a great way of bringing fresh air into the house and recycling the stale, stinky air. Likewise, if there is an outside smell, leaving the vent open may invite the stench into your home.