# Window micro-ventilation: fresh air without draughts Controlled, small-scale air exchange that helps against humidity and condensation without losing heat. Modern windows are so airtight that they have an unexpected side effect – insufficient air exchange in the room. This can lead to higher humidity, condensation and even poorer air quality. Micro-ventilation solutions are the answer to this problem. ## Why do modern windows cause this problem? Older windows insulated poorly, but they let the room "breathe" through small air leaks. Modern airtight windows prevent that – great for insulation, but it means the room needs another way to get fresh air. ## What is micro-ventilation? Micro-ventilation is a controlled, small air exchange mechanism built into the window construction or hardware. It lets a small amount of air circulate continuously without significant heat loss and without a noticeable draught. ## How does it work in practice? ### Tilt micro-ventilation Tilt-and-turn windows often allow the sash to rest slightly open in a tilt position, giving controlled air exchange without compromising security (the window is not fully open). ### Built-in trickle vents Some window profiles have dedicated ventilation elements that provide a constant, minimal airflow even when the window is fully closed. ### Adjustable airflow Some solutions let you adjust the intensity of air exchange depending on the season or the needs of a specific room. ## Why does it matter? ### Humidity control Constant, small air exchange helps prevent condensation and mould, which often appear in airtight rooms with insufficient ventilation. ### Air quality Fresh air lowers CO2 levels in the room, which affects well-being, concentration and sleep quality. ### Energy saving Unlike opening windows regularly, which causes significant heat loss, micro-ventilation provides air exchange with minimal impact on heating costs. ## Where is this solution especially relevant? - Bedrooms, where fresh air at night affects sleep quality - New, energy-efficient homes, where airtightness is high and natural ventilation is limited - Rooms with a higher moisture risk – kitchens and bathrooms ## Does micro-ventilation replace a full ventilation system? Micro-ventilation complements, but does not replace, a full home ventilation system (for example, heat recovery ventilation). It solves a specific, local need – constant, small air exchange at a particular window – but for larger projects it is worth considering the home's overall ventilation concept. ## Related articles Condensation on windows Window opening types Home heat loss checklist ## Want to know whether micro-ventilation suits your home? Book a free consultation – we will discuss how to get fresh air without compromising insulation. info@nordicwindowsolutions.com · +371 22324322 Book a consultation