YSK: If an HVAC tech says you're low on refrigerant but doesn't say anything about a leak check, they may be scamming you.
from /r/YouShouldKnow
YSK：如果暖通空調技術員說你的製冷劑不足，但卻沒有說要進行泄漏檢查，他們可能在騙你。
YSK：如果暖通空調技術員說你的製冷劑不足，但卻沒有說要進行泄漏檢查，他們可能在騙你。
YSK: If an HVAC tech says you're low on refrigerant but doesn't say anything about a leak check, they may be scamming you.
from /r/YouShouldKnow