I still think that it would be more cost effective in the long run to run 30 RHPs, because they would be on proportional thermostats. It would cost a lot to setup, but in the long run I believe it would pay off. I could be wrong though. It would be nice to know exactly how much it costs per month to run one RHP and how much it costs to run a space heater for a month. Then we could determine how many RHPs it would take to equal the amount of one space heater for a month.