Contact Us Ground Source Systems, Inc. 1639 Montana HWY 35 Kalispell, MT 59901 406-755-2665 Thank you for your interest in Ground Source Systems, Inc. and a geothermal comfort system. Please fill out the form below and someone will contact you shortly. We'll answer any questions you have and can provide you with a free estimate for your unique geothermal situation in Western Montana and the surrounding region. Required Required Not a valid email Required Not a valid phone number Height in meters Keyboard Layout Preference Weight in Kilograms