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Opening windows in winter feels counter-intuitive, so most of us avoid it.

But the air inside our homes quietly changes through the day.

Cooking, showers, breathing and drying clothes all add moisture to the air. When windows stay closed, that warm, moisture-laden air has nowhere to go.

Moist air actually takes more energy to heat and often feels colder and heavier, even when the thermostat says otherwise.

A short burst of ventilation replaces that damp, stale air with colder, drier outdoor air.

Once the windows are closed and the heating goes back on, that drier air warms faster and more evenly.

This isn’t about leaving windows open or losing heat for hours. It’s about brief resets, a few minutes, once or twice a day to let moisture and pollutants escape before they build up.

Homes that breathe regularly feel more comfortable, warm more easily, and are simpler to manage through winter.

Morning (after showers / cooking)
Open windows for 5–10 minutes
Create a cross-breeze if possible
Close windows, then turn the heating back on

Evening (after the day’s moisture builds up)
Another 5–10 minute air reset
Focus on kitchens and bedrooms

During high-moisture activities
Crack a window or use extract ventilation
Close it once moisture clears

What to avoid
Leaving windows tilted open all day
Ventilating while heating is running
Heating damp air repeatedly

Simple rule
Ventilate briefly. Then heat.
#indoorairquality