My personal suggestion is to ditch the red light, and any other lights, and use a ceramic heat emitter instead. They do not kill humidity as bad. You can use a dimmer with the CHE so you can turn it down and adjust as needed. You could insulate like others mentioned to help trap some of the heat on the cool side. I just do want to verify that you have the heat mat on a thermostat? If not, you'll need one ASAP before a burn happens.