We propose a new method for producing ice by winter air in cold regions, and perform tests with an apparatus assembled as trial. The apparatus consists of two parts, a heat exchanger and an ice making part, to get high thermal efficiency. The tests yield the following results: 1) The production rate of ice is estimated to be 2 similar to 19 kg.h(-1) from the heat intake ability of the ice maker, which was obtained by the tests carried out at refrigerant (25 wt% calcium chloride) temperatures of -4.4 similar to -14.5 degreesC at the inlet of the ice maker and at refrigerant flow rates of 1.0 similar to5.6 l.min(-1). 2) The production rate of ice is 3.5 similar to6.8 kg.h(-1) in the proof tests, which were carried out at outdoor temperatures of -5 similar to -10 degreesC (refrigerant temperatures of -3 similar to -8 degreesC at the inlet of the ice maker) and refrigerant flow rates of 1.3 similar to5.2 l.min(-1).