While I am waiting for the gas company to run their gas line, I remembered something one of the contractors said when he was looking at my current heat pump system.
We were looking at the outisde unit, and he saw a filter dryer installed on the line. From this he said that the heat pump must have had some trouble in the past, because there was a filter dryer installed.
So my question is are these filter dryers standard equipment and installed on new systems, or was he right to assume that they are only installed if problems occur?
I don't know the history of our unit so I have no clue if he was right.