I have been wanting to do it for a couple years I want to put in elctric base board heat in my boys bedroom. It is on the second floor farthest room form both pellet stoves. It is not cold in thier room but I want to make it comfy for them on the real cold upstate day and nights. the room is approx 12' x 20' all open room with 7' ceiling. I am looking at qmark hydronic electric baseboard heater with a honeywell line voltage progamable t stat. and not sure what wattage to get I think 500w is not enough they make 750,100, 1250, 1500,& 2000. I just cant find anything on calculating for supplamental heat. I am looking at during the day keeping it at 60 in hte evening 70 and at night 65. on average the room is at 60 during the day with the stove running.