Hello--
What kind of wall? Is this a room that is well-insulated, or cement block at the core? Also, is it a herp room with independent heating, or a room heated by the same thermostat/heat as the rest of the house? My advice would be to buy a temp gun--ProExotics has a line that are reasonably priced. That way you can check the temps in different parts of the enclosures as the temps outside fluctuate. I am originally from CT, and I found that temps do vary when it gets cold.
Just a couple of suggestions--don't put the enclosures flush against the wall--allow 6 inches of space between wall and enclosure. Also, check the room for drafts--a cold draft can wreak as much havoc as a cold wall.
I now live in a place that is warmer than CT, but still gets cold. My herp room is a well-insulated converted garage with it's own thermostat/electric wall heater. I cover the windows with heavy fabric to avoid drafts, and put my heat-loving tropical/desert species on the "warm" end (end with the heater, 82 degrees). I also check weatherstripping on the doors and windows. My more temperate species get the "cool" end near the covered windows/outside wall(75-80). I use supplemental heat lamps/UTH as needed. Hope this helps.
rgds,
althea