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Will Closing Vents in Unused Rooms Boost HVAC Efficiency?

It’s common to have some rooms in your home that always get too hot in the summer or too cold in the winter.  In an effort to force more air into the needed room(s), you close some vents in the little-used rooms. This may seem like a good idea, but you may be doing more harm than good when you seal up or block vents.



When you close a vent register, the system keeps cooling and pumping without delivering the cool air to a usable space. You're basically paying to keep the inside of your ductwork cold!  In fact, this may lead to increased energy consumption due to increased duct leakage of conditioned air, and increased suction of unconditioned air from around doors and windows.  If the return air grate for your home is located in or near the closed off room, then you’ve really created a problem!  This can cause the compressor and condenser to cycle too frequently, and puts strain on the whole system, leading to accelerated wear and ultimately, an early failure. Plus, with the added pressure against the closed vent, it is apt to start “whistling” or making a rattling noise.  Why risk this damage when it doesn’t work and won’t even save energy? 


If you only want to keep a single room cooler or warmer, consider adding a ductless mini-split system, or adding an additional register or enlarging the existing registers in that room.  Checkout our posts about uneven heating and cooling and our 3-part video series on zoning for other possible solutions.  But the best thing would be to have a skilled HVAC technician evaluate your problem, so you’ll have confidence that the solution they propose will work… instead of spending money on things that may not.

If you live in the Nashville area and want to make sure your air-conditioning or heating system is running at peak efficiency, call on Interstate AC Service, at (615) 832-8500.  We’re here for YOU!

Important Tips & Advice



You often don't think about your heating or air-conditioning system until something goes wrong. But there is so much you can do to help keep your system from breaking down. We regularly post information to help you learn what you can do to keep your system running, to save money and energy.  Search our many posts, videos, and podcasts, for valuable information that is never a sales pitch. Subscribe to receive an email when something new is posted, so you won’t miss any important tips.

Choosing a Repair Company

Whether you’re talking about heating or cooling, repairing or replacing a system, you want a company that can advise you reliably based on what is in your best interest, not based on what is convenient or what earns them the most money (commissions). We'll help you choose the best solution to fit your needs. Check out our many posts at HVAC News You Can Use and our podcasts.

Going Green

We're concerned about the environment and know all the latest technologies - such as geothermal systems, LED lights, and smart thermostats - that can reduce energy and put more "green" in your pocket!  We've provided HVAC systems in certified LEED buildings and written many posts on ways to Go Green.

The Sign of Service

We are a repair company performing a full range of commercial and residential heating, air conditioning, energy management and comfort products service, maintenance, and installation. We are a locally-owned company serving Nashville-Davidson County and the surrounding counties including Williamson, Rutherford, Wilson, Sumner, Robertson, and Cheatham.

Who We Are

Our service technicians are fully trained and experienced.  We can tackle the most complicated system to the simplest of systems – from large commercial plants to single-family homes.  Our ownership group of Eddie Hutton, Tony Anderson, Roger Eldridge,  Swaney Powers and Alan Seilbeck have over 125 years combined experience as leaders in the HVAC industry.


We are proud of our dispatchers that respond to your telephone call. When your system is down they make things happen. Our trucks are loaded with most parts needed for a quick repair. You can call day and night 7 days a week. Our normal weekday hours are 7:00AM to 5:00PM. Click on the button below to schedule a service call online. Emails and forms can only be answered weekdays from 7-5.”  

615-832-8500 Online Service Call


Did you know you should service your HVAC on a regular schedule – just like you would your car?  We have specialized maintenance programs to ensure the clean, energy efficient and safe operation of your HVAC systems.  This helps minimize service interruptions/breakdowns and maximize your equipment's lifespan.  All maintenance contract customers are assigned a primary technician that will get to know your facility and equipment and will treat it like his own.  You’ll receive discounts on repairs or new installations, and get priority service when it is cold or hot outside and you need service promptly.  Plus, maintenance contract customers are never charged overtime rates for emergency services after-hours, weekends or holidays. We’ll teach you how to save on maintenance costs by showing you things you can do yourself and when you need a technician. Here are some good posts:  Repair vs. Replace, Things to Try Before Calling for Service, Springtime Tips that Pay Off.


Our team takes on HVAC projects for office, school, retail and industrial facilities. Check out these case studies:

Replacement of a 250-ton Cooling Tower

Ductless HVAC at Brentwood Middle School