My house stays between 68 (lowest temp in winter) and 75 (hottest temp in summer) with temps normally in 72 to 74 range so I'm going to try without a RHP for awhile and see how that goes. I'm gonna have two fluorescent lights, one on each side for daytime light so that will also help a few degrees.
Eric, can you explain why you preferred the back to the middle? I've heard people like one or the other but never their reason why.