Room size, sun, people and climate — size your AC like an engineer, not a salesman.
Cooling tonnage for a room from area, occupancy, glazing and equipment — better than sq-ft rules.
Tonnage estimate tuned to a composite climate (north india) (~15 m²/ton) with occupant & sun corrections.
BTU class (9/12/18/24k) for a ductless mini-split, with insulation quality factor.
ENERGY STAR-style BTU sizing for window units with the standard room corrections.
Airflow a room needs for a target air-change rate from its dimensions.
Monthly electricity cost of an air conditioner from capacity, efficiency and duty cycle.
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