How to Properly Ventilate Rooms in Winter: Common Mistakes 0 23

Experts provide the following recommendations:

How long to keep windows open:

• Below −10°C — 2–3 minutes.
• From −10°C to 0°C — 5 minutes.
• Above 0°C — 10–15 minutes.

How often to ventilate:

• 2–4 times a day (in the morning, after work, before bed).
• It’s better to create short drafts than to keep the window slightly open constantly.

Main mistakes:

1. Micro-ventilation instead of a draft — air is poorly renewed, the room cools down, and condensation appears.
2. Prolonged ventilation without necessity — unnecessary heat loss, walls and slopes cool down.
3. Ventilating only when stuffy — regular ventilation is important, not episodic.
4. Lack of air circulation — furniture placed too close to walls obstructs airflow, increasing the risk of mold.

Symptoms of improper ventilation:

• Condensation on windows — indicates that air is not being renewed and humidity is elevated.

Conclusion: short ventilation sessions 2–4 times a day for 5–10 minutes in winter refresh the air, retain heat, and prevent mold.