Hi Josephine,
The main cooling and insulating systems used in refrigerators on Saibai Island would likely include traditional compression refrigeration systems with standard insulation materials such as polyurethane foam.
The power rating of refrigerators required by residents on Saibai Island would depend on factors such as the size of the refrigerator, its energy efficiency rating, and the specific cooling needs of the household. The accommodation we stayed(the council building) at had 2 star refrigerator.
Hope that helps.
Cheers,
Sai
Sai Rupa Dev