In a wooden viv, I'd recommend either a CHE (ceramic heat emitter) or a RHP (radiant heat panel). The RHP will dry the air less, but is more expensive. In order to run a heat mat, you'll need to either get a Kane (expensive) which can be used inside the viv, or you'll need to cut a hole in the floor of the viv and install a glass or Plexiglas panel and use a UTH (under tank heater) . Regardless of the heat source, you NEED to use a thermostat to properly regulate the temperatures! You can get a Hydrofarm stat for about $30 delivered from Amazon or eBay.