The bin for techs whose study guide is older than the rules: the current leak-rate triggers (not the old exam keys), the January 1, 2026 15-lb HFC rule, chronic leakers, and the recordkeeping that applies now. Every answer shows the rule and its citation.
Rules current as of October 21, 2026.
One question at a time, instant feedback, running score. No sign-up, nothing saved — your answers never leave this phone or browser.
Studying for the real exam, or a certified tech checking the new rules? Either way, if an old study guide disagrees with an answer here, the citation under the answer is the one to trust.
