The Geothermal Name to Trust in Interlochen Forgive the pride, but that would be us: D&W Mechanical! Interlochen, Michigan, residents have been turning to us to meet their geothermal heating and cooling needs for a number of years, now. We'd like to earn your assurance, as well. If you've been thinking of “going geothermal” but have been holding off, you can certainly trust us on this: given today's unstable economy, there's never been a better time to find out the savings a geothermal heating and cooling system can offer. Want facts? Do a little simple math with our Geothermal Savings Calculator. Then contact D&W Mechanical for the finest geothermal system installation and service in Interlochen - and beyond! Oh ... and talk about trust: We install geothermal heating and cooling systems by WaterFurnace. That's a brand that resonates in the geothermal industry.