In areas where district cooling is available, the District Cooling Operator provides chilled water to buildings. Without chilled water submetering infrastructure, the owner incurs the total cooling consumption cost for the building

This cost is then allocated to tenants as a service charge based on unit floor area rather than actual consumption. BTU submetering service involves installing metering devices to measure the real-time consumption of chilled water supplied to a building. These devices, known as BTU submeters, calculate the thermal energy used by monitoring the temperature difference and flow rate of the chilled water entering and leaving the cooling system.