Residential Air Conditioning

Below you will find a summary of the code requirements for replacing and installing residential air conditioning units.

Required items to submit with application:

  • 3 copies of Plat of Survey with proposed location of air conditioner on Plat with noted dimensions to lot lines.
  • List the number of tons of the unit or BTU rating.
  • Manufacturer’s specification sheets.
  • Electrician’s name, address.
  • Contractor Registration Application, $1,000,000 Certificate of Insurance listing homeowner as the additional insured pursuant to a written contract.  There is a $50 fee for registration.
  • Building Permit Application (signed by homeowner)

Construction Specifications:

  • Unit must be placed on a 2½” concrete slab, an angle iron secured to foundation, or other methods approved by a building official.
  • A disconnect is to be installed at or near (within 8’ of) the condensing unit.
  • If the unit is 3 or more tons, minimum #8 gauge wire is required and is to be placed in conduit.
  • Units under 3 tons, minimum #10 gauge wire is required and is to be placed in conduit on a single circuit.
  • 100 amp circuit box is required.
  • Twin, tandem, duplex or split circuit breakers are NOT allowed.
  • Circuit breaker shall be properly sized for the unit.
  • All electrical work shall be installed in compliance with the 2011 National Electric Code.

Where can my air conditioner be located?

The air conditioner shall not be located on an easement or a setback.

How much will my permit cost?

  • Permit Processing Fee $25
  • Permit Fee $75.00 per unit

Required Inspections:

  • Final Inspection required after all work is completed.


  • Call before 4:00 p.m. to schedule an inspection a minimum of 24 hrs. in advance.  You can request an a.m. or p.m. inspection, Monday thru Friday.
  • Give the permit number and address when calling in for inspections.
  • If the inspector needs to return more than once for the same phase of any required inspection, a $100.00 re-inspection fee is required to be paid before re-inspection.
  • No re-inspection on the same phase of construction will be done in the same 24-hour period.

This handout is written as a guide to common questions and problems.  It is not intended nor shall it be considered a complete set of requirements.  If you have any questions, please contact the Building & Zoning Department at 847-438-6000 for further information.

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