1.Which insulation has the lowest R-value per inch?
1.哪种隔热材料每英寸的 R 值最低？
2.Which insulation is easiest to install in an older home?
2.在老房子里，哪种隔热材料最容易安装？
3.When does a contactor provide water heater warranty info?
3.承包商何时会提供热水器保修信息？
4.Water heater relief valve pipe requirement?
4.热水器安全阀管道的要求是？
5.When is a Freon recovery system NOT required?
5.什么时候不需要氟利昂回收系统？
6.Minimum insulation for water heater pipes?
6.热水器管道的最低保温要求是多少？
7.What does LPG stand for?
7.LPG 代表什么？
8.What does an “R-value” measure?
8.“R 值”衡量什么？
9.Which device lacks a continuous pilot?
9.哪种设备没有持续引燃装置？
10.When is a Freon recovery system required?
10.什么情况下需要氟利昂回收系统？
