I bought a new Tstat yesterday that actually has the temp on the dial and got a bigger uth for my new large tank. Heat gun gives me accurate temps but it isn't what the Tstat is saying! Prec is hanging out in the middle behind some plants where gun says it's 85...guess she knows best. Probe is on warm side on substrate just behind warm side hide. Heat gun is saying it's 87 there. Tstat says 90. She has enough aluminum foil on top of her screen and around heat lamp to keep the government from getting hold of her communications (joke). I just don't know what to do, other than spend more money on a boaphile tank right now that I just don't have the money for. Everything was perfect until this colder weather came in. It's 78 in the room. Any ideas anyone?