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：如果暖通空调技术员说你的制冷剂不足，但却没有说要进行泄漏检查，他们可能在骗你。
YSK：如果暖通空调技术员说你的制冷剂不足，但却没有说要进行泄漏检查，他们可能在骗你。
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