The answer
Why is a multi-room price not simply the single-room price multiplied?
Price depends on the cooling or heating load of each room, the number and type of indoor units, outdoor-unit position, pipe and drain routes, electrical work and installation access. A multi-room job is not simply several single-room prices added together.
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Why room count is only the start
A sunny glazed room with computers and several occupants can require a different capacity from a shaded bedroom of the same size. The survey should consider room use, heat gains and the desired temperatures before selecting equipment. One outdoor unit serving several rooms can reduce visible plant but may increase routing complexity and create a shared point of failure.
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What should the price include?
Indoor and outdoor units, brackets, pipework, condensate drainage, electrical supply, controls, commissioning and making good should all be clear. Long pipe runs, high-level work or restricted access add labour. If the system will heat as well as cool, ask about cold-weather performance and how hot water is handled separately.
Where this guidance comes from
Check the original guidance.
These primary sources support the technical or scheme points above. Rules can change; follow the current source before making a commitment.
Apply this to your property
Get a layout, not a price per room.
FLO's free survey checks loads and practical routes so the air-conditioning quote reflects the rooms you actually want to serve.