For your convenience, mind to the commodity here:

In curt, the answer to this question is no. Although closing off unused rooms may seem like a way to save energy on heating and cooling, it can actually force your HVAC system to work harder. In club for your air conditioner to work efficiently, you should go along the interior doors in your home open every bit much as possible.

Ventilation is Key

Even though yous tin't e'er feel information technology, the air in your home is constantly moving. Hot air rises and cooler air sinks. Your HVAC system circulates air through your home only similar your heart circulates blood through your arteries and veins. For instance, the air conditioner draws air out of your house through the intake vent, passes that air beyond the evaporator coils, and so sends the chilled air back into your home through the registers. Somewhen, that same air will become drawn dorsum to the intake vent and go through the cycle all over once more.

See Also: The Forgotten V in HVAC

While all houses have some "leaks," for the most role the home is a closed, balanced organization. In other words, your HVAC is designed to draw air out of your domicile at the same rate that it sends air back in. This allows the total amount of air inside your home stays the same. And that'southward why closing interior doors causes problems.

Come across Besides: Why Do You Need a Duct Pressure Test

You lot see, when a room in your home is closed off, the HVAC all the same pumps air into that room through the register. This is unless yous close the register, which can crusade VERY serious issues for your HVAC, and then don't do information technology! Just the air in that room is trapped. It can't travel back to the air intake vent. If there'due south a gap under the door, the air in the room tin can slowly escape just not chop-chop enough to continue up with the HVAC's intake. This has two big negative effects.

Negative Effects

  1. The closed-off room becomes pressurized. This means that the conditioned air inside it starts looking for any mode to escape. Often that means leaking into the attic or out of gaps effectually windows. This tin waste the free energy used to rut or cool that air.
  2. The residual of the firm becomes depressurized every bit the HVAC tries to draw in more than air than is present. This causes outside air to get sucked in through the chimney, gaps under the outside doors and windows, and other tiny openings.
Encounter Besides: Lower Your Energy Beak This Summer

Plainly on a hot summer day, the exterior air will take lots more energy to absurd than already-conditioned inside air would. This again means that you'll be wasting energy. T o maximize the efficiency of your HVAC system likewise as your comfort, don't close off unused rooms. Let the air flow through your home similar it'due south designed to. Your air conditioner and your wallet will thanks!

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