I had some in coastal Los Angeles for 8 years. Eventhough the climate was a few degrees milder than inland, I preferred to keep them indoors for the first 1-2 years. Once outdoors, mine stayed out year round. They need to have a dry hide box with a kane heat pad. There needs to be sufficient space for the iguana to get on and off the heat pad in the hide box so that they can thermoregulate. The hide box should be designed to be easy to clean. Even though the day temp may only be in the 60's, there are ways to make hot spots - such as black roof shingles placed in a sunny location, or a plexiglass roof with a shelf directly below it - similar to the dashboard on a car.
