Chiller Systems Service, Inc. opened its doors in 1997 serving primarily as an independent chiller service company. Our valued clients have asked us to do more and more for them over the years and our team of professionals have responded with a high level of enthusiasm, expertise and execution. Because of the many services we now offer, we have started the Chillers Plus brand to reflect our growth. When building owners, property managers and engineers think of Denver HVAC contractors, we are often viewed by many as the top provider of service, repair, retrofit and predictive, energy, performance solutions for all HVAC built-up systems including chillers, boilers, pumps, fan systems, heating, controls, ventilation, air conditioning and refrigeration systems.