If you give us a better idea of what you are doing, your system size, the lay of your land, we might be able to better serve you. There's no simple answer or one-size-fits-all type answer. There are many passive and active technologies out there capable of cooling your system during the day and heating it at night (I assume your temps drop drastically in that climate).

Every unique geographic area has its own set of challenges. Even withing the same state, county, or city. Give us more information or get further along in your project and then send us pictures (each one is worth 1,000 words). There are a lot of clever people on this forum; so, we can definitely give you some decent suggestions!