Connecticut Limited Warm Air, Air Conditioning and Refrigeration (D-1, D-2) Certification Exam

Connecticut Limited Warm Air, Air Conditioning and Refrigeration (D-1, D-2) Contractors holding D-1 and D-2 credentials legally perform HVAC installations, maintenance, and repairs across Connecticut commercial and residential properties. With certification in hand, you’re positioned to bid on licensed projects, manage service calls independently, and expand your contracting business scope—this credential is your legal permission slip in the state’s regulated HVAC market.