Jeff Mackay Mechanical works with customers across New Hampshire to show them the benefits of regular HVAC maintenance services. It's important to maintain your heating and cooling system to prevent unexpected and expensive problems with your unit stops working. When property owners neglect to schedule routine mechanical services, it can result in an HVAC system failure when you need it most. Leave your mechanical services to a skilled professional who grew up in the industry, knows what they are doing, and can provide quality work.