I have been wordening what is the best kind of heater i could i get to put on wall or hang from ceiling. by wall i got some rails two of them with 2ft arms two get the heater away from wall the rails are 5ft long so i can keep itjust above plants or where ever i should any info on heater &should i keepjust above plants or where? thanks you for any info. and the controller room 7.5 ft tall how high should it be thanks. :? :? :?