Nearly every jurisdiction requires a mechanical permit for a condenser, air handler, furnace, or full system changeout — even a like-for-like swap. The application is short, but the equipment data has to match the AHRI-rated combination on the invoice, or the inspector fails the final.
Minnesota jobs get the national baseline packet. Every field a building department needs is covered; state-specific attachments are being added market by market.
One page: what a Minnesota building department checks on this document, and the attachments that most often hold up issuance.
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General guidance for Minnesota contractors, not legal advice. Confirm requirements with the authority having jurisdiction before filing.