BEE collects data directly from the manufacturers. Whenever a manufacturer launches a new product, it gets it tested in a lab accredited by NABL (National Accreditation Board for Testing and Calibration Laboratories) and sends the results to BEE.
The model gets tested in a NABL accredited lab for a few days. The power consumption and efficiency are tested at 100 percent and 50 percent capacities. And then the performance is checked to running conditions in different seasons.