I have 2 inserts to install before winter. First is a Lopi Freedom and second is a Napoleon 1402 both mid 90's models in good shape. One needs to be installed in my living room it has about a 30' chimney with a heavy smooth wall liner. I intend on using the insert in the living room the most. The other will be installed in my hearth room open to the kitchen. It has an 18 chimney with the thin wall liner. Both liners will be insulated any suggestion on which insert to place where?