1 ton AC vs 1.5 ton AC

It's the amount of energy extracted from the air-conditioned space by a certain AC.
1 Ton in SI units is = 210 KJ/min or 3.5 KW

In earlier days, people used ice blocks for colling space. They coined a standard measurement term for this cooling effect along with a time factor to make it easier.
So, a ton of refrigeration is the amount of heat absorbed by a ton of ice at 0-degree Celsius to get converted into water in 24 hours.

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