This tool can recommend not buying AC. Start with the room problem, permission and budget—not a product.
This is a planning score, not a diagnosis. It can recommend not buying an air conditioner.
Open the next step →A hot room does not automatically require an air conditioner. The useful question is which intervention changes the actual problem with the least cost, installation and disruption.
Record when it becomes uncomfortable, the indoor temperature if available, which windows receive sun and whether the outdoor air becomes cooler overnight. One exceptional afternoon is different from repeated sleep loss or an occupied loft that stores heat.
External or early internal shading, controlled ventilation when outdoor air is cooler and reducing internal heat gains can materially change the need. A fan improves perceived comfort but does not normally reduce the room temperature.
A portable unit needs a safe, well-sealed exhaust route and storage. A split system can be quieter and more efficient in use, but needs permission checks, professional design and appropriately qualified installation.
Limit: The score is an orientation tool, not a diagnosis of heat-related illness, a building survey or a promise that equipment will achieve a chosen temperature. Official heat-health advice takes priority.
Move from the current answer to sizing, evidence and a clear commercial next step.