Our Reviewers

These are the people who check our pages against official sources. Where a profile links a licence or bar record, we checked it in the official public lookup; other background is taken from the reviewer’s own published profiles.

• GB

  Gary B. Xavier

  HVACR Instructor & Author, EPA 608 Universal

  Gary B. Xavier is a stationary engineer and HVACR instructor with about 50 years in the field and the author of Goodheart-Willcox's Math for HVACR. He holds EPA Section 608 Universal certification and is an EPA proctor and NY-licensed building code enforcement officer.

• CM

  Craig Migliaccio

  NJ Master HVACR Contractor & Founder, AC Service Tech · NJ Master HVACR Contractor licence 19HC00425100 (Active)

  Craig Migliaccio founded AC Service Tech, whose YouTube channel and courses train HVACR technicians. He holds a New Jersey Master HVACR Contractor licence (19HC00425100), is licensed by New Jersey to teach HVACR, sheet metal and building maintenance, and earned NATE certification in heat pumps and AC service/installation in 2004.