Why it matters to you
Any technician who connects gauges to, recovers refrigerant from, or recharges your Greater Houston AC or heat pump needs this certification, and the same law prohibits knowingly venting refrigerant into the air. It is separate from Texas's TDLR air conditioning contractor license, which covers the contracting business.
Practical guidance
It is reasonable to ask whether the technician working on your refrigerant circuit is Section 608-certified, and you can verify a contractor's license with TDLR. Homeowners should never buy, add or release refrigerant themselves.