Refrigeration and Air Conditioning
The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

0.5 to 0.8 h.p. per ton of refrigeration
1 to 2 h.p. per ton of refrigeration
2 to 5 h.p. per ton of refrigeration
0.1 to 0.5 h.p. per ton of refrigeration

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Refrigeration and Air Conditioning
One ton of the refrigeration is

The refrigeration effect to produce 1 ton of ice at NTP conditions
The cooling effect produced by melting 1 ton of ice
The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
The standard unit used in refrigeration problems

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