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Connecticut Limited Heating Cooling License (D-3 and D-4) Certification Exam

Connecticut Limited Heating Cooling License (D-3 and D-4) Certification Exam

Original price was: $149.00.Current price is: $124.00.

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Connecticut Limited Heating Cooling License (D-3 and D-4) Connecticut’s D-3 and D-4 heating-cooling exams zero in on real installation and troubleshooting work. You’ll face questions grounded in actual job scenarios—sizing equipment for residential loads, diagnosing refrigerant leaks, connecting ductwork safely. Passing means proving you can read schematics under pressure and apply code-compliant practices to common field problems, not memorizing theory alone.

Related exams

We list 98 Connecticut exams in total - the full set is on the Connecticut Certification Exam page. Nearby: Connecticut Limited Warm Air, Air Conditioning and Refrigeration (D-1, D-2), CT Ag1 Glazier (auto), and CT Ag2 Glazier (auto) Jrny.

The same for every download on this site

Everything here is supplied as a PDF plus a practice-test engine, targeting the 2026 version of the exam objectives. It is an instant digital download - nothing is posted, and the timings are set out on our fulfillment process page.

Payment is one-off. There is no subscription and no renewal fee.

These are study materials, not exam questions supplied by the certifying body, and no pack can guarantee a pass. If a download will not open or does not match what the page described, our refund policy applies - contact us and we will put it right.

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📅 Last Updated: August 16, 2026 (2 days ago) ✓ Total Q&As: 300
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