So I just got my corn today and was told to use the Exo-Terra Heat wave Rainforest UTH for her.. and I just can't seem to feel the heat.. is that normal? It feels just a little over room temperature.. and she feels cold.. is that normal? Is this the right UTH for her? Should I get something else? What should the glass feel like? Should I worry about the winter time here.. it gets cold here.. Help please!