In captivity, adult Iguana's require a Habitat, Compound, Den, Vivarium , call it what you will, of at least 6' x 5' x 4'. Basking area temp may be a little higher, as long as the Iguana is able to move to a cooler spot to Thermoregulate. Iguana's require moderate to high levels of humidity. You can help achieve this by misting the Vivarium every other day, Spray misting the Iguana himself and frequent bathing. A large dish of water in his habitat will also help with this.
Humidity also helps considerably with the shedding process.
Supply a large fairly deep water dish for drinking, with fresh water provided daily. If the Iguana also uses this for bathing, then keep an eye on it with a view to changing even more regularly, as Iguanas have a strong tendancy to defacate in water. Two very important features. Iguanas need UVB light to convert Vitamin D into its active form, in this active form it can then assist in the absorption of Calcium into the body. Further more detailed Anatomy information is available on the Ignatomy page.