How much cooling do you actually need?

In much of Europe, kW is the headline number shoppers see first. It is a direct metric label for cooling capacity, not product quality. In practical terms, it tells you how much cooling output an AC can deliver, and that makes it a useful buying shortcut when you are narrowing the field.

The useful part is not chasing the biggest rating. The useful part is matching the capacity to the room you actually need to cool. A small bedroom, a sunny kitchen, and a wide open-plan lounge all place very different demands on the same machine.

Sizing matters because an undersized AC rarely catches up on hot afternoons, while an oversized one often cools too aggressively and then switches off before it has handled humidity properly. This calculator uses a simplified Manual J style approach to account for room area, ceiling height, heat sources, and occupancy quickly. It is not a substitute for a full professional load calculation, but it is a strong filter for portable, window, and split AC shopping when you want a realistic starting range instead of guesswork.