Experts Advise Against Closing HVAC Vents in Unused Rooms: Here’s Why

As temperatures drop, homes transition from cooling to heating modes. Many homeowners consider closing HVAC vents in unused rooms to save energy. However, HVAC experts recommend keeping all vents open for several important reasons.

Risks of Closing HVAC Vents in Unused Rooms

It may seem sensible to close vents in less-used spaces, but this practice can lead to significant issues. Experts note that restricting airflow creates pressure problems within the HVAC system.

Increased System Strain

Micah Sherman, a virtual HVAC expert, explains that closing vents can cause air pressure to build up. This results in the system exerting extra effort, which may lead to damage over time.

Eli Zimmer, director of operations at Luxaire HVAC Services, emphasizes that increased pressure can compromise the system’s efficiency. “When pressure builds, the system has to work harder, which can become hazardous,” he states.

Disruption of Airflow

According to Richie Drew from One Hour Heating & Air Conditioning, airflow must remain consistent to maintain system balance. Closing vents disrupts the airflow necessary for effective heating or cooling.

Moreover, furniture placement can also obstruct vents, causing unwanted moisture issues. If airflow is restricted significantly, the coils may freeze, risking further damage.

Understanding System Imbalance

Restricting airflow not only impacts efficiency but also leads to an imbalance in the HVAC system. When vents are closed, the blower motor pushes air through fewer openings. This increased pressure causes the blower to work excessively hard.

Energy Consumption and Equipment Longevity

The choice between a variable speed blower and a fixed speed blower can influence system performance. Variable speed blowers may draw more energy to maintain airflow, while fixed speed blowers can overheat or freeze due to lack of sufficient airflow.

Over time, increased pressure results in higher operational costs and reduced lifespan of components such as the blower fan and compressor. This causes systems to short-cycle, leading to inefficient heating or cooling.

Potential Ductwork Damage

Jordan Benjamin, president of Done Rite Services, warns that closing vents may cause leaks in ductwork and lead to uneven temperatures throughout the home. Thus, the general recommendation remains to keep all vents open.

Alternative Solutions for Unused Spaces

If you still prefer to control areas of your home, consider consulting an HVAC technician about installing a zoned system. Tim Algaushove, COO at IRBIS Air, Plumbing & Electrical, notes that this setup allows for independent temperature control in different sections of your home.

Maximizing HVAC Efficiency

To keep your HVAC system running smoothly, follow these steps:

• Annual Service: Schedule professional maintenance to clean coils, remove debris, and ensure drain lines are unobstructed.
• Keep Vents Open: Ensure that vents are unobstructed by furniture or other items.
• Open Doors: Leave doors open in seldom-used rooms to prevent air from becoming trapped.
• Regular Cleaning: Clean vents frequently and change air filters every 30 days or according to your system’s guidelines.
• Check Seals: Monitor airflow from each vent. If airflow decreases, inspect ductwork for potential leaks.

Following these guidelines will help your HVAC system operate efficiently, ensuring comfortable living spaces without unnecessarily increasing energy costs.