HVAC certifications fluctuate by state, plus some states have to have technicians to be certified by passing tests. The easiest method to find out what certifications and licenses you need is to go looking “[your state] + HVAC license restrictions” on Google or simply click your condition on this map. https://zanebjqvc.tdlwiki.com/1187778/little_known_facts_about_preferred_content_language_english