If an ordinary residential unit won't work for you, then you should consider something such as a Santa Fe, Ultra Aire, or another unit made by Therma-Stor. These are the kind that can be ducted, have ... read more
It sounds like the back room of the house was really cold during the winter. One thing to consider is to insulate your house from the outside before using either type of siding. This can be done by t ... read more