Search the forum here for ReptiFlo and you'll see how popular it is! That should definitely help your humidity, but buy a hygrometer anyway. You can find a basic one to monitor your humidity for under $10 in a national chain pet store, or a better one online for $15-$20 plus shipping. Your snake needs 40% to 60% humidity most of the time and ~70% when in shed, but you don't want it that high for him all the time.