Comparisons

Air conditioning or opening the window?

Air conditioning cools and circulates the air but does not bring in fresh air from outside. For fresh air you need to open the window. With a window filter, dust and pollen stay outside while the window is open; alternating it with the air conditioning is the most balanced approach.

Published: 17 October 2026 · 2 min read

Short answer

Air conditioning and the window are not alternatives but complements. The air conditioning manages temperature; the window refreshes the air in the room.

What air conditioning cannot do

Most home air conditioners do not take in fresh air from outside; they recirculate indoor air.
In a closed room, carbon dioxide and humidity keep building up.
If its filters are not cleaned regularly, it can become a source of dust and mould.

Balanced use

Open the window and air the room in the cool of the morning or evening.
In the hot hours of the day, close the window and use the air conditioning.
To stop dust and pollen pouring in while the window is open, fit a window filter.

In offices

Offices with many people need more fresh air. Offices and workplaces – you will find tips on that page.

Offices and workplaces

In an office or shop on a busy street, opening the window means dust settling on desks and products. A window filter, the workplace…

Odera window filter fitted to a window with hook-and-loop tape

What is a window filter?

A window filter is a thin filter fitted to windows and doors like an insect screen; it lets air through and holds back dust, pollen and tiny insects…

Open your window, keep dust and pollen outside

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Last updated: 17 October 2026