Geothermal Heat Pumps

A Geothermal Heat Pump System is a mechanical device, also known as a ground source heat pump or geoexchange system, which uses the geothermal exchange properties and the relatively constant temperature of earth formations for heating or cooling a building space.


An open-loop system using either a water well supply or return well for the disposal of used water likely requires a well construction permit issued by the local health department.  The wells must be constructed in accordance with the state well code.


Since closed-loop systems do not extract groundwater, the DEQ does not have authority to regulate their installation under the state well code.  However, some local health departments do have requirements for closed-loop systems, and those individuals installing these systems need to comply with all applicable local requirements.


The information below should be consulted before a geothermal system is installed in Michigan.

Geothermal Statute Discussion
The Michigan Department of Environmental Quality (MDEQ) is reigniting the process for establishing a state statute for the purpose of regulating the installation of Closed Loop Geothermal Heat Pump boreholes.  As part of that process we are convening a Stakeholder Meeting to gain input on this topic.  The meeting is scheduled for November 13, 2017, from 1:00 p.m. to 3:30 p.m. at Constitution Hall, 525 West Allegan Street, Lansing, Michigan, in the Con-Con A and B Conference Room.  To attend the meeting on November 13, 2017, enter Constitution Hall through the east entrance off of the parking lot and check in at the security guard desk.  If you have any questions, please contact David DeYoung at or 517-284-6526.