I purchased an aprilaire 700, and I plan to install a 15a electrical outlet on the furnace right where the electrical comes in. If I first feed hot wire to outlet, and then feed off outlet to furnace, what is the best way to install the transformer? Can I just double up and twist the hot wire together on one of the terminals? Also, can I just sit this on top of the outlet box or should I try to put it inside the furnace? Thanks!