OOPS! This may be confusing, it's a typo!

However it was extremely cold out and he said that he was going to
attach the grounding wire to the Service conduit that runs from the
room of the house to the ground after he came in and warmed up and
finished hooking up the receivers.

Should have been...

However it was extremely cold out and he said that he was going to
attach the grounding wire to the Service conduit that runs from the
**roof** of the house to the ground after he came in and warmed up and
finished hooking up the receivers.