Old Mission, Michigan, Geothermal Heating & Cooling We're getting the word out in Old Mission, Michigan: in in the condition the economy is in today, geothermal heating and cooling is absolutely the right choice! Soil conditions in Old Mission are perfect. How about our seasonal temperatures? They vary enough in extremes to virtually guarantee that geothermal heating and cooling will offer the best year-round comfort. You'll love how much a geothermal system can cut your energy expenses, too. The proof? Take a look at our Geothermal Savings Calculator. Contact Kalkaska Pumbing & Heating Inc. today. We've got a lot more to tell you about the benefits of geothermal heating and cooling in Old Mission. Another great thing, we install and service WaterFurnace geothermal systems, the finest on the market.