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Check out ManhattanBeachRE.com for very detailed info on MB homes.
Like everybody else had already mentioned, most homes do not have conditioners and don't need them. The newer models will most likely have the connections for it, but is not needed. Most of the time at night, we just place a sweat shirt on because it usually dips to the high 60's. Good luck with your search.
Living in Thousand Oaks, you have many days of temperatures near 100 degrees, but living at the beach is a whole different environment. Our high temperatures usually vary no more than 10 degrees due to the moderating influence of the ocean.
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Most older homes in the beach areas do not have A/C. Being that close to the beach, keeps the weather mild (not like in Thousand Oaks!). Some of the newer homes do have it, because it is expected in a newer home.
Most homes in the area do not have air conditioners and for the most part, they just aren't really necessary. Some of the new construction homes have installed air conditioning as the homes are quite expensive and the builders want to ensure that the homes have everything that a buyer could possibly want. Whether you would need it also depends on the location of the home and whether you get some of the ocean breezes that seem to keep things cool on even the hottest day. I've lived in Hermosa for 17 years and don't have air conditioning and until the home west of mine built a second floor and eliminated my breeze (as well as my view unfortunately) I had never even considered it. Ceiling fans are generally all you need during the summer. It's this weather that makes us want to live here. I see that you're in Thousand Oaks and I grew up in Calabasas.....so I know about that Valley heat in the summer.
I hope you find your way down here at some point as it's a fantastic place to live.