Is Closing Vents in Unused Rooms a Good Idea?

If you’re looking for ways to lower energy costs, it may seem like a smart idea to close air vents in rooms you rarely (or never) use. After all, redirecting conditioned air away from those spaces should save on energy expenses, right? Surprisingly, that’s not the case.

Closing vents in unused rooms can create several issues that may actually increase energy costs and strain your HVAC system. HVAC.com explains the reasons behind this practice and the potential problems it can cause.

The Appeal of Closing Air Vents

Some homeowners believe that closing vents in unused rooms will reduce the workload on their HVAC systems, ultimately leading to lower energy bills. By preventing air from flowing into these spaces, it’s thought that the system can focus its energy on the rooms that are actually in use, leading to shorter run cycles and lower energy consumption.

The Downsides of Closing HVAC Vents

In reality, closing air vents to save money is a common HVAC myth. Some of the downfalls of closing vents include:

Airflow Imbalance

The potential for airflow imbalance is one of the most significant issues with closing air vents in rarely used rooms. HVAC systems are designed to operate with a certain balance of airflow. When you close air vents, it can create negative pressure in the system, causing it to work harder to push air through fewer openings. This imbalance can lead to uneven heating or cooling, making some rooms uncomfortable while others remain unaffected.

Increased Strain on the System

Closing vents can also put additional strain on your heating and cooling system. When the airflow is restricted, the system has to compensate by running longer and harder to maintain the desired temperature. This can increase wear and tear on the unit, potentially resulting in costly repairs or a shorter system lifespan.

Impact on Air Quality

Proper airflow is necessary for maintaining good indoor air quality. Closing vents can disrupt the circulation of air throughout the home, trapping pollutants and allergens in closed-off areas. This can lead to a buildup of dust, humidity issues, mold spores, and other contaminants that can negatively affect the health of you and your family members.

How to Save Money Without Closing HVAC Vents

Install a Zoning System

For areas of your home that are seldomly used, consider installing an HVAC zoning system. This allows you to control the temperature in different areas of the house without closing off vents. For example, if you have a guest room that you only use a few times a year, you can set the thermostat lower or higher (depending on the season) when the room isn’t being used for increased energy savings.

Invest in Regular HVAC Maintenance

Instead of closing vents, ensure you schedule regular HVAC maintenance with a local HVAC dealer. Regular maintenance – including air filter changes, cleaning necessary components, and tightening electrical connections – can improve efficiency and comfort throughout your home. 

Changing your air filter regularly can have a much greater impact than closing air vents. A clogged filter can restrict airflow into your system, causing it to strain. This can lead to reduced airflow, higher energy costs, and wear and tear on components. Inspect your air filter once a month, and replace it when it’s clogged and dirty.

Inspect for Duct Leaks

Checking for air duct leaks can boost overall efficiency by making sure that heated or cooled air reaches your living spaces instead of escaping through gaps. This means lower energy bills and a more comfortable home, with improved indoor air quality, to boot.