A refrigerant recovery unit includes a refrigerant storage unit, a refrigerant circuit, a processor, and a memory. The refrigerant storage unit is configured to store a refrigerant. The refrigerant circuit is in fluid connection with refrigeration system. The refrigerant circuit is configured to recover refrigerant from the refrigeration system and recharge the refrigeration system with the refrigerant. The processor is configured to control the refrigerant recovery unit and the processor is configured to control a fan. The fan is configured to provide a flow of air to the refrigeration system. The memory is to store diagnostic software and operating software to operate the refrigerant recovery unit.