Minus21 is a local air conditioning and refrigeration business that aims to provide quality services for value for money, in the beautiful Wide Bay area. We pride ourselves on building positive relationships with our customers, by maintaining clear communication, being honest and upfront, and by listening and responding to their requests. Air Conditioning Installation: We are able to supply and/or install a wide range of air conditioning systems. Commercial Refrigeration: Minus21 is able to service and repair a range of refrigeration systems. Preventative Maintenance We offer two air conditioning preventative maintenance services.