The kW/ton (pronounced “kilowatt per ton”) rating of a Chiller is:

Definition of kW/ton

is the value used to measure Energy efficiency of the cooling system, showing that
“How many kilowatts of electrical energy is required? To produce cooling 1 tons of cooling (12,000 BTU/hr)”

Calculation formula

\text{kW/ton} = \frac{\text{Electrical energy used (kW)}}{\text{Cooling produced (ton)}}

The lower the kW/ton value = the more energy savings.

Standard kW/ton (general average)

Chiller type, general kW/ton value, kW/ton value that is considered good.
Air-Cooled Chiller 1.1 – 1.5 kW/ton ≤ 1.0 kW/ton
Water-Cooled Chiller 0.6 – 0.8 kW/ton ≤ 0.55 kW/ton

✅ Compare

Air-Cooled Water-Cooled Item
Installation is easy, no complicated cooling tower required. Must have a cooling tower.
Maintenance Lower Higher
Electrical energy is used more and is more economical (low kW/ton).
Suitable for medium/small buildings. large building factory

Tips
 • If you want a system that Save the most energy → Choose Water-Cooled.
 • If you want Convenient to install and easy to maintain → Choose Air-Cooled