In direct cool refrigerator, refrigeration takes place by circulation of cool air naturally without any external aid. Hence, there is no way you are able to control the temperature distribution.
Frost free technology on the other hand, works on the principle of even distribution of cool air inside the fridge by electric fans. As there is no formation of ice, there is no need of defrosting.
20 models of regular-selling brands of double-door, frost-free refrigerators with 240–300 litres capacity have been surveyed. These include 2 models of Godrej, 5 models of Haier, 4 models of LG, 4 models of Samsung, 2 models of Panasonic, 2 models of Voltas, and 1 model of Whirlpool.
Comparison has been done on Gross Volume (litres), Storage Volume (litres), Electricity Consumption (unit per year), Convertible Type, BEE Star Rating, Price (Rs), Warranty (years).
Details of survey on various parameters are available in the 'May 2019 Consumer VOICE Print and Digital magazine.