Mich. Comp. Laws § 339.5819: Installation of heating or refrigerating system by owner of single family dwelling.

Sec. 819.

An individual who is the owner of a single family dwelling that is, or on completion will become, his or her place of residence may personally install a heating or refrigerating system in the dwelling if the individual in his or her application for a permit affirms that he or she is or will become the owner and occupant of the dwelling in which the installation is done is completed and that the applicant will install the equipment in the dwelling for which the permit is requested. The applicant shall apply for and secure the required permits from the enforcing agency of the municipality and shall obtain the required inspection after the installation is completed and the equipment is placed in operation.