Frankfort Looks to Us for Geothermal Heating & Cooling! We're D&W Mechanical. And we're recognized throughout Frankfort, Michigan, for our geothermal heating and cooling expertise. Residents turn to us for ... superior geothermal system installation and service qualified, highly trained personnel who know every detail of geothermal heating and cooling - and know how to effectively communicate the process to you geothermal systems from one of the industry's most reliable names - WaterFurnace advice on how to get the most from their geothermal heating and cooling installation Obviously, a major reason people turn to us to begin with is for the savings they can get on their energy bills with a geothermal system. Want a look? Give our Geothermal Savings Calculator a go. Then take the next step and contact D&W Mechanical. We'll show you more of what makes geothermal systems the premium choice for year-round heating and cooling comfort in Frankfort.