4A Mechanical 1&2 Family Dwelling Residential Mechanical Inspector Certification Exam

4A Mechanical 1&2 Family Dwelling Residential Mechanical Inspector Recent updates to the 4A Mechanical inspector certification now emphasize heat pump efficiency ratings and variable refrigerant flow (VRF) system inspections, reflecting widespread residential adoption of these technologies. Inspectors must evaluate ductless mini-split installations and verify proper refrigerant charge using modern diagnostic tools. The exam has expanded its coverage of building envelope sealing requirements that directly correlate with mechanical system performance in single and two-family homes.