This can be likened to a stone warmed by the sun. The sculpture warms the air as it rises to the warmer air at the top produced by the light system. Reinforced screening for ventilation acts as a barrier from contact to these lights. A ceramic heater can replace these if you wish, however it is not necessary. Greenery is important as all animals should have the option to be able to hide and camouflage providing them with the security they need if they feel stressed or threatened.
Adequate ventilation is a very important factor as well.
The unit is designed to allow air to flow in from the lower front section of the unit as the warmer air escaping out of the top rear section pulls it in. This creates a gentle air flow system replenishing the air constantly. When it comes to cleaning , it is very quick as you can rinse the unit down where it's needed. Especially with Iguanas, they prefer to do their business in the water. This prevents you from ever having to really clean the upper half making it so practical and quick to clean after them.