Offering HVAC Repair, Plumbing Service, and More to Harwich, MA, and Surrounding Areas Make sure that your plumbing and heating are properly taken care of by working with an expert. At Dunphy Heating & Plumbing, we can provide HVAC repair, plumbing installation, and more to clients near Harwich, MA. We work with both residential and commercial clients and will treat your building as if it was our own. By choosing us, you can be confident the job will be done right.