what are your daytime temperatures? you dont want too broad of a swing (no more than 20 degrees) low 60's is fine as long as daytime temperatures are not too high but its cutting it close... If it starts to drop into the 50's then i'd concider adding a heater.
__________________ Posting Guidelines Acceptable Use Policy 
"What are you trying to tell me, that I can dodge bullets?" "No, Neo. I’m trying to tell you that when you’re ready... you won’t have to."
~ Neo & Morpheus, The Matrix |