What Permits Do You Need to Replace HVAC in Wisconsin?
Guide to HVAC replacement permits in Wisconsin, covering furnace, air conditioner, and ductwork permits, inspection requirements, and energy efficiency standards.
Yes, you typically need a permit. To replace an hvac system in most Wisconsin municipalities, you need a HVAC Replacement Permit. Here's exactly what's required.
Permits Required
The following permits are typically required to replace an hvac system in Wisconsin. Actual requirements vary by municipality.
HVAC Replacement Permit
A streamlined permit for like-for-like HVAC equipment replacement in Wisconsin. Many municipalities offer a simplified application process when replacing existing furnaces, boilers, or AC condensers with similar equipment in the same location. Still requires inspection to verify proper installation, venting, and safety compliance.
Inspection required after work is completed.
Where to Apply
Permit requirements, fees, and processing times vary by municipality. Check the specific requirements for your location:
Browse all jurisdictions →Exemptions & Special Cases
In some circumstances, a permit may not be required. Common exemptions include:
- HVAC Replacement Permit: Routine HVAC maintenance and cleaning
- HVAC Replacement Permit: Thermostat replacement
Exemptions vary by municipality. Always confirm with your local building department before starting work without a permit.
Frequently Asked Questions
Do I need a permit to replace my furnace in Wisconsin?
Yes. Replacing a furnace or any major HVAC equipment requires a mechanical permit in most Wisconsin municipalities. This applies to furnaces, boilers, central air conditioners, and heat pumps — even when replacing with the same type of equipment in the same location. Permit fees are typically $50 to $300 depending on the city and scope of work.
Can a homeowner replace their own furnace in Wisconsin?
Wisconsin homeowners can perform HVAC work on their own owner-occupied single-family home, but you must pull the required mechanical permit and the work must pass inspection. Given the safety implications of gas line connections, exhaust venting, and electrical connections, most homeowners choose to hire a licensed HVAC contractor. Improper installation can void manufacturer warranties.
What efficiency standards apply to new furnaces in Wisconsin?
Wisconsin follows federal minimum efficiency standards. As of 2023, gas furnaces installed in Wisconsin (Northern climate zone) must have a minimum 95% AFUE rating. Central air conditioners must meet SEER2 requirements. Your municipality may have additional energy code requirements. Focus on Energy offers rebates for high-efficiency equipment that exceeds minimum standards.
Building in multiple cities?
See permit requirements for any Wisconsin municipality instantly. Compare fees, timelines, and processes side by side across your active jurisdictions.