How to properly ventilate housing with PVC windows

Why ventilation matters with PVC windows

Modern PVC (uPVC) windows are airtight and energy efficient. They reduce heat loss but also limit natural air exchange. Without proper ventilation, moisture and pollutants accumulate, causing condensation, mold, and poor indoor air quality. Good ventilation protects health, preserves finishes, and prolongs window life.

Key principles

Frequency beats duration: short and frequent airing is better than leaving windows ajar for hours.
Create cross-ventilation to refresh air throughout the whole apartment.
Use intensive short airing in cold weather and longer, gentler airing in warm seasons.
Target indoor relative humidity: 40–60%.

Practical methods of airing

1. Quick intensive airing (winter method)

Open windows wide or create a draft by opening windows in opposite sides of the apartment.
Time: 5–10 minutes is usually enough to replace indoor air while minimizing heat loss.
Close windows after airing so the room can reheat quickly.

2. Tilt mode / micro-ventilation

Many PVC windows have a tilt position for micro-ventilation — useful at night or when you need mild air exchange.
Note: tilt mode provides slow ventilation and does not replace periodic full airing.

3. Create a draft when possible

Opening windows in different rooms for 7–15 minutes provides a full air change.
This is especially effective after cooking, cleaning, or showering.

4. Ventilate after wet activities

After showering or cooking, increase ventilation intensity; use exhaust fans in bathrooms and kitchens together with window airing.

Seasonal advice

Winter: brief, intense airing — 5–10 minutes, 2–4 times daily (morning and evening recommended).
Spring/Autumn: 10–20 minutes, 2–3 times daily depending on outdoor temperature.
Summer: longer opening periods are fine; protect openings from insects and excessive heat.

Maintenance and window care

Clean drainage holes at the base of the frame to prevent water accumulation.
Inspect and replace worn seals to keep the window airtight when closed.
Adjust hardware: some windows allow you to change strike plate positions to modify air infiltration.
Keep ventilation grilles and mechanical inlet valves clean.

Technical options for continuous ventilation

Exhaust fans in kitchen and bathroom with automatic controls.
Window-mounted or frame-integrated inlet valves (trickle vents) for constant fresh air without drafts.
Small mechanical ventilation units with heat recovery (HRV) for whole-house solutions.

Common mistakes to avoid

Avoid leaving windows tilted for too long in winter — it reduces energy efficiency.
Don’t block ventilation inlets or exhausts to save heat; it causes high humidity.
Avoid drying laundry indoors without ventilation.

Condensation and mold control

Inner-surface condensation indicates excessive humidity — increase airing and use exhausts.
For mold, clean with appropriate cleaners and address the root cause (ventilation, leaks).

Practical tips

Air in the morning and after coming home.
Use kitchen extractor and open a window while cooking.
Keep tilt ventilation overnight if needed, but do a morning full airing.
Use a hygrometer to maintain 40–60% humidity.

FAQ

Can I leave the window in tilt position all day?

You can, but tilt mode provides slow air exchange. Combine tilt ventilation with occasional full airing for best results.

Will airing damage seals or hardware?

No, regular proper use won’t damage seals. Regular inspection and lubrication of hardware will prolong lifespan.

How often should a two-bedroom flat be ventilated?

Generally 2–4 times daily for 5–15 minutes, plus targeted ventilation in kitchen and bathroom after use.

Is airing enough to remove mold?

Airing helps prevent mold, but existing mold needs cleaning and elimination of moisture sources; consider mechanical ventilation if problems persist.

If you need help adjusting window fittings, selecting a trickle vent, or choosing a hygrometer — we can advise on concrete models and simple settings for your PVC windows.