Do I need a permit for HVAC work in
Columbus, Mississippi?

Columbus HVAC permits — the key details

Columbus Building Department enforces the 2021 IMC Section 301.1 (Mechanical Systems) and 2021 IECC Section 503 (HVAC Efficiency) as adopted by the City of Columbus with Mississippi amendments. The core rule: any installation, replacement, or modification of a heating, cooling, or ventilation system that serves a residential or commercial space requires a mechanical permit before work begins. This includes air conditioning units, furnaces, heat pumps, ductwork modifications, refrigerant line installation, and ventilation hood systems. The only blanket exemption under IMC 101.1 is maintenance — cleaning filters, lubricating bearings, replacing capacitors, refrigerant top-ups — work that does not alter the system's design or capacity. Repairs (fixing a failed compressor, sealing a duct leak) sit in a gray zone; if the repair restores the system to original condition without changing tonnage or ductwork layout, many jurisdictions allow it without a permit, but Columbus Building Department may require documentation that the original system was permitted, which often doesn't exist for units installed before the 1990s. The safest approach: call the permit office before you hire a contractor and describe the scope, asking whether a permit is needed. They will cite the specific code section and tell you yes or no — that phone call costs nothing and protects you.