There is disclosed a device for cooling a server rack within a server room having a first chamber and a second chamber, the device comprising: a main chilling unit; a heat exchanging unit operatively coupled to the main chilling unit; the main chilling unit including a housing for housing: an evaporator; a first airlock device to removably secure the main chilling unit to the server rack from a side of the first chamber; a first fan configured to force air from the first chamber to the second chamber; the heat exchanging unit including a housing for housing: a condenser in fluid communication with the evaporator, the condenser being configured to transmit heat from the liquid coolant to air surrounding the condenser; a second airlock device configured to removably secure the heat exchanging unit to the second chamber; a second fan configured to blow the heated air into the second chamber.