Debunking HVAC Myths: Does Closing Unused Room Vents Actually Save Energy?
At Perry Heating, Cooling, and Plumbing, we often hear from homeowners who believe they’re saving energy and money by closing vents in unused rooms. It’s an intuitive idea that seems to make perfect sense: why heat or cool a room nobody’s using? Unfortunately, this common practice might actually be costing you more while potentially damaging your HVAC system.
The Myth: Closing Vents Saves Energy
Many homeowners believe that by closing vents in unused rooms, they’re reducing the area their HVAC system needs to condition, thereby saving energy and lowering utility bills. This seems logical at first glance, but modern HVAC systems don’t actually work this way.
The Reality: How Your HVAC System Actually Works
Your heating and cooling system is designed to distribute air throughout your entire home based on specific calculations. When you close vents, several problems can occur:
- Increased pressure in your ductwork – Your blower motor continues working at the same rate, but now has fewer outlets for airflow
- Reduced efficiency – The increased pressure makes your system work harder, consuming more energy
- Potential system damage – The extra strain can lead to premature equipment failure
- Duct leakage – Higher pressure can worsen existing leaks in your ductwork
The Science Behind It
Modern HVAC systems are carefully balanced when installed. Your system was sized specifically for your home’s square footage and layout. When you close vents, you’re disrupting this balance without actually reducing the system’s workload. In fact, most systems have a fixed-speed blower that will use the same amount of energy regardless of how many vents are open.
What Happens When You Close Vents?
Rather than saving energy, closing vents can:
- Force air through leaks in your ductwork
- Create pressure imbalances that make your system less efficient
- Potentially freeze your air conditioner’s evaporator coil
- Crack your heat exchanger (in heating systems)
Better Ways to Save Energy
Since 1949, Perry Heating, Cooling, and Plumbing has been the leading HVAC and plumbing company for Tucson, AZ and surrounding communities. Based on our extensive experience, here are some effective alternatives that actually work:
- Install a programmable or smart thermostat to adjust temperatures based on your schedule
- Consider zoning systems that allow legitimate, safe control of different areas
- Schedule regular maintenance to keep your system running efficiently
- Improve insulation in your attic and walls
- Seal leaky windows and doors to prevent conditioned air from escaping
When Professional Help Makes a Difference
If you’re concerned about energy efficiency or have rooms that never seem comfortable, the solution isn’t closing vents. Instead, you might benefit from a professional evaluation of your system.
Our experienced technicians can identify issues with your ductwork, assess whether your system is properly sized, and recommend appropriate solutions that will truly save energy while maintaining comfort throughout your home.
The Bottom Line
While closing vents in unused rooms might seem like a clever energy-saving hack, it can actually lead to higher energy bills and costly repairs. For genuine energy savings, contact Perry Heating, Cooling, and Plumbing for a professional assessment of your home’s HVAC system.
Have you been closing vents thinking you were saving energy? You’re not alone! Contact us today to learn how we can help you achieve real energy efficiency without compromising your system’s performance or lifespan.