Hass Geosystems, Inc. is a family owned and operated plumbing and heating contractor in Frazee, MN offering plumbing, HVAC and geothermal heating and cooling installation, repair and service. As a fully licensed, insured and bonded company, you can depend on our professionals for quality workmanship every time. Our trained and certified technicians have over 30 years of experience. We serve residential and commercial customers throughout Detroit Lakes, Park Rapids, Perham, and surrounding areas.