Should you open windows in winter? Air quality experts warn it's a vital winter maintenance task you should never skip

You'll be forgiven for thinking opening windows regularly is better reserved for when it's bright, warm and sunny outside. But did you know it is just as beneficial in winter, too?

Air quality experts say knowing how often you should open windows in winter can help solve several common winter household complaints, including mold and musty smells, as well as combating condensation build up.

Here, they break down why you should open windows in winter to improve air quality indoors, and how to do it without freezing or sending your energy bills rocketing.

Should you open windows in winter?

Yes, you should. Not only does opening windows in winter reduce condensation, but it can drastically improve the quality of the air you breathe, too.

This, in turn, can improve your health by reducing CO2 levels and airborne germs, boosting your mood, and even helping you sleep better – which is one reason you should consider sleeping with your windows open in winter, too.

Jon Gilbertson, president and CEO at Chris Heating & Cooling says, 'While it’s common advice to avoid opening windows in winter to conserve heat, doing so can actually enhance your home's atmosphere.

'Consider opening windows selectively based on air quality needs, such as after cooking or cleaning, to release odors and contaminants. This approach not only supports better indoor air quality but also gives your heating system a break, as it can help regulate humidity levels, preventing the air from becoming too dry. Just remember to open windows for shorter periods to minimize heat loss.'

How to open windows without freezing in winter

Of course, opening windows in winter is not as simple as opening them in summer. Comfort and heating considerations should be taken into account in the colder, wetter and windier months.

Leaving the windows open for too long could send your bills sky-high, and leave you shivering in your own home. To help cut energy bills and make your heating more efficient, there is a technique to follow says Max Veggeberg, CEO at Tetra.

He suggests, 'If homeowners need to open their windows to improve air quality, we recommend for no longer than a few minutes and during the warmest part (sunny afternoons ideally) of the day to reduce heat loss.'

Jon Gilbert, HVAC expert, adds, 'This is especially important in high-traffic areas [such as your bedroom] or rooms with stale air. This method allows fresh air to circulate without causing significant heat loss.'

A good approach to clear out stale air is to open windows on opposite sides of the house, creating a cross breeze that will push stale air out more quickly, reducing how long you need to leave the windows open.

Installing a smart thermostat will help you to control your heating bills, too, allowing you to easily control your heating so that it does not turn on while the windows open to make your home more energy efficient.

All prices were correct at time of publishing.

If you live in a very cold climate, or with vulnerable people such as children or the elderly, and it is not safe or convenient to open windows in the dead of winter, there are alternatives.

Jon Gilbert, HVAC expert, says homeowners can 'Install an air exchange unit designed specifically for cold climates. These systems pull in fresh air while retaining heat from the outgoing air, maintaining indoor warmth.

'Alternatively, consider using smart sensors to keep track of your indoor air quality. They automatically adjust ventilation systems and/or air purifiers based on real-time data, ensuring optimal conditions.

'Plus you can incorporate natural odor absorbers like activated charcoal or baking soda in key areas,' he adds. 'These materials can neutralize smells, such as getting rid of musty smells in a bedroom, and reduce the need for external air exchange.'

While there are ways to improve ventilation in your home in winter, there is no denying that investing in the best air purifier is your best bet. Be sure to choose the right air purifier for your home based on the size of your space for maximum efficiency.

Not opening your windows in winter is also a bad habit increasing the risk of mold in your home, especially at a time when they heating is on and the air inside is humid.

No matter the heating costs, opening them for just five minutes a day is more than worth the payoff.