Please do not use them. They try to scare you into thinking you need a new furnace and it was unsafe . Then he rearranged our hoses so we would have problems when the air conditioner. They claim they didn’t do it.
I
Additionally just heard that my daughter used them as well and they tried to “scare “ them into purchasing g a new one as well. They had someone else come out and they told her she didn’t need one.