Why not having trickle vents could be more serious than you think
Briefly

Trickle vents are small openings in window or door frames that allow a continuous flow of fresh air, crucial for proper home ventilation. They help mitigate issues like mold and moisture accumulation by ensuring that stale indoor air is exchanged with fresh outdoor air. While they can be seen as unsightly or a source of drafts, their role in maintaining a healthy living environment underscores their importance, especially in homes prone to humidity. Not every house requires them, but lacking them in certain homes can lead to serious moisture problems.
Home ventilation is the exchange of air between what is inside the property and the fresh air outside. Inside, the air is typically warm, moist and often stale as we generate a lot of moisture as part of our daily routine through bathing, cooking, drying clothes, and even breathing.
They are small openings built into window or door frames that allow a continuous flow of fresh air into a building, even when the windows are securely closed.
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