Commercial Refrigeration, On Farm Refrigeration, Domestic & Commercial Heat Pumps/AC Sales, Service & Repair. Maintenance and Installation Hamilton. JSR REFRIGERATION is a family owned and operated refrigeration and air conditioning company based in Hamilton and servicing the Waikato and Coromandel region. At JSR Refrigeration you will receive the best advice possible for all your refrigeration, air conditioning and heat pump installation requirements. The staff at JSR are highly skilled and qualified in the area of mechanical engineering and air conditioning design and installation. They will ensure you the best possible advice and service at very competitive prices. We offer a FREE design service to make sure that all your requirements are meet and to ensure that you have the right products to help REDUCE YOUR POWER ACCOUNTS.