Donelson Air Service Experts Heating & Air Conditioning, using the best tools in the industry for the best techs in Nashville. hilmor has a simple design philosophy – [[create|provide| tools that are a step ahead. The kind that are equipped with features that save our customers time, frustration and maybe even a few headaches. Each tool is designed with all of the features you need and none of the ones you don’t. They are made to work in the toughest environments. The kind you encounter – day in and day out. hilmor has transformed into a strong American-based brand determined more than ever to bring ingenuity to the tools you’ve come to rely on every day. Simply put, we’re making it our mission to help you keep your cool even in the most sweltering of conditions. More advancements. More streamlined designs. More ways to help you get the job done right. Together, we’ll conquer it with products ranging from flaring and swaging tools, to manifolds and service tools.