Under certain circumstances, a project under the REEL program requires CAS/CAZ testing.

• A project includes three or more eligible measures, the property contains one or more combustion measures and at least one of the eligible measures is:
  • Whole-building air sealing
  • Duct sealing and/or duct replacement
  • Attic insulation and air sealing
• A CAS/CAZ test must be performed by a participating contractor who is:
  • Approved to participate in the Energy Upgrade California Home Upgrade Program or Advanced Home Upgrade Program
  • Certified by BPI as a Building Analyst, Envelope Professional, Heating Professional, Air Conditioning and Heat Pump Professional, or BPI GoldStar Contractor