Insulating a Cathedral Ceiling

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We bought a house made in 1960 in southern California. It has vaulted ceilings and no attic. There was never any insulation put in the walls of the house or above the ceilings. During the summer it gets really hot upstairs. We have installed ceiling fans. There is no air conditioning. We have not experience a winter yet. Can we install/blow installation into the walls/ceilings? Would it be worth it?

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