The most important part of what JW writes is "putting it below ground".
You need to do what you can while building to give you a more consistent temperature.
Local greenhouses likely do not house live animals (not on purpose at least) so while they'll be helpful - you need to look at them with your own needs in mind.
Originally Posted by geckguy
Well it looks like I need to start getting some money together. I will check out some local green houses and see how they are building them, and start reading. Thanks.