Should you close off unused rooms in winter?

Author: Dr. Millie Robel DDS  |  Last update: Tuesday, June 23, 2026

Closing vents in individual rooms will not help your energy cost, but actually hurt your system. “Closing vents puts a strain on the system, which in turn causes the system to work harder,” Martin says.

Is it better to keep rooms open or closed in winter?

Yes, open doors are generally better in winter to maintain a consistent temperature. They allow your heating system to distribute warm air evenly across rooms, improving comfort and efficiency while preventing energy waste.

Does closing doors of unused rooms save heat?

Contrary to popular belief, closing your bedroom doors does not improve the efficiency of your HVAC system and may actually increase your utility bills. When you close a bedroom door, you effectively block the air's pathway, and that blockage can lead to issues with airflow.

How often should you air out your room in winter?

Air your apartment 3 to 4 times a day, for 5 to 10 minutes, in the winter.

Which vents should be closed in winter?

To utilize your supply vents strategically, we suggest: Closing supply vents in higher locations by your ceilings while opening lower ones on floors or close to baseboards. Doing this will direct more warm air to the floor, where it will rise to heat the whole space.

Rising heating costs: Can you save money by closing vents in unused rooms?

Is it bad to close vents in unused rooms?

Closing the vents doesn't do it any favors. In fact, instead of helping the air conditioner cool less, closed registers force the same amount of air through other ducts. This builds pressure in the system and makes your HVAC system work harder to distribute the air where you need it.

Should you leave vents open in winter?

Keep your home ventilated

Open windows at least once a day, keep window trickle vents open, and air vents uncovered. It's important that air can move through your home as ventilation is one of the best ways to avoid mould, as flowing air means spores can't settle somewhere and absorb water.

What happens if you don't air out your room?

Effects on overall health

Fresh air does not enter and stale air is not removed to the outside. The consequences are: Increased risk of respiratory diseases such as asthma and allergies. Increased risk of developing respiratory problems.

How cold should I let my house get at night?

The best winter thermostat setting is 62 to 68 degrees. On winter days, program your home's thermostat to 68 degrees for a comfortable indoor temperature while you're home and awake. When sleeping, program your thermostat to 62 degrees. Consider rolling this temperature back to 55 degrees when no one is home.

Should I turn off ventilation in winter?

Ventilating is important all year round. During the winter months, you should open your house at least once a day, no matter how bitterly cold it is outside. It doesn't have to be for long, opening a window or door for even just a few minutes will create a cross-draught.

Is it okay to partially close air vents?

Because heat rises, homeowners can consider partially closing upstairs vents and fully opening those downstairs. The top floor often steals most of the heat, but partially closing vents can help to keep other areas of your house warmer without damaging or stressing your house's HVAC system.

Does closing bedroom door keep room cooler?

Scenario 1: If your home only has one return air grille, the answer to this question is a hard No. Closing the bedroom doors in your home does not cool the room better, save energy, or decrease your monthly electric bill. In fact, it increases your energy expense.

Why is my second floor so hot in the winter?

First, heat rises, so it's normal for the second floor of a home to get hotter than the main floor.

Should I heat unused rooms in winter?

Remember, despite it being counter-intuitive, it's best to let your heater warm up your basement, attic or spare room, even if you don't use them much. Another great way to keep your home warm and efficient, in addition to implementing energy efficiency improvements, is to properly maintain your home's heating system.

Should you close the kitchen door at night?

Be sure to close all internal doors at night as this will help to stop any fire or smoke from spreading should a fire occur. Finally, take your phone with you to bed so you can call for help in the event of an emergency.

Should I close doors in unused rooms?

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 order for your air conditioner to work efficiently, you should keep the interior doors in your home open as much as possible.

What is the cheapest temperature to keep your house in winter?

To save money, aim to have your temperature set around 68-72 degrees Fahrenheit when you're at home and awake. This is a comfortable temperature for most with the help of a light sweater. Overnight and when you're out, around 64 degrees Fahrenheit will keep your home at a good temperature.

Is 64 too cold for a house?

The World Health Organization recommends keeping indoor temperatures between 64 and 75 degrees Fahrenheit for healthy people. The minimum temperature should be kept above 68 degrees Fahrenheit to protect the very young, the elderly, or people with health problems. Watch out for signs of hypothermia.

What temperature to leave a vacant house in winter?

Whether you plan to leave for a vacation or for the season, most heating and cooling professionals recommend setting the thermostat to 55 degrees Fahrenheit. This temperature will reduce your heating costs and minimize the risk for hazards such as frozen or burst pipes and flooding.

How often should you air out your house in winter?

Intermittent ventilation

Open your windows or doors as wide as they will go to maximise the amount of air that can be exchanged. Doing this for around 10 minutes twice a day will be enough for most rooms. You can use a cross breeze or draft to make this even more efficient.

Is it bad to sleep in a room with no air flow?

CO2 levels that are higher than 1150 ppm will typically occur in bedrooms that are not fitted with a ventilation system and where windows and doors are closed. Above 2600 ppm: Insufficient ventilation—both sleep quality and next-day performance are adversely affected.

What are the symptoms of lack of fresh air in your house?

Occupants of homes with poor indoor air quality may complain of symptoms such as headache, eye irritation, fatigue, dry throat, sinus congestion, dizziness, and nausea.

Should you close vents in unused rooms in winter?

“No, you should never close vents in individual rooms,” says Brad Martin, Field Service Manager for Boer Brothers Heating & Cooling in Chapel Hill, North Carolina. HVAC systems are designed to maintain a specific and balanced airflow known as CFM, or cubic feet per minute, throughout a home.

Which vents should be open in winter?

Here's what to do:
  • In colder months, close supply vents in higher locations, like up by ceilings, while opening lower ones on floors or close to baseboards. ...
  • In warmer months, do the opposite — open the supply vents in higher locations and close the ones placed lower.

Can spiders get in through trickle vents?

Spiders don't wait for you to come home from work or the school pick-up and then stroll through the front door, hoping you won't see them. They're a little more ambitious. They'll come through open windows, trickle vents (the narrow plastic openings above windows used to control air flow) and exterior air bricks.

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