We're the Geothermal Source in Portage! Portage homeowners in the know look to Crystal Valley Comfort for all their geothermal heating and cooling needs. They trust us to provide not only the proper installation and service but also the experience to help them get the most from their geothermal systems. Considering a geothermal system of your own? Give our nifty little Geothermal Savings Calculator a try. Just fill-in your data and marvel at the results. Then, contact us, the Portage, Michigan, geothermal experts at Crystal Valley Comfort.