1. The COP efficiency of low-temperature chillers is relatively low, around 2.6-3.3, and the building area used is generally not more than 10000 square meters. However, they can be used for both cooling and heating, and are more cost-effective for general shopping malls, small commercial buildings, and office buildings.

2. The COP of water-cooled chillers is generally high, around 4-5.5, suitable for large buildings and some process cooling.

3. In principle, the only difference is the condenser. Low temperature air-cooled chillers use a fan to cool the refrigerant in the condenser, while water-cooled chillers use cold water to remove heat from the condenser and release it into the atmosphere through a cooling tower.

4. Water cooled chillers can only cool, and other heating methods such as electric heating, steam heating, or hot water boilers are required for heating.