If you can I would try to order a set of domes that have a dimmer built into them and you adjust your temps like this. Or you can buy a lamp dimmer at Walmart for about 10 bucks. Or you can find some cheaper thermostats that don't have both features ( heating/humidity) that are still good products but are only half the price of the Hygrotherm. Not saying you need things you could tinker with it yourself, just thought I would throw these suggestions out there for ya to think about.