I agree with adding additional insulation to the attic space above the air conditioned spaces in the house. But, I don't agree with installing insulation on the ceilings that are located above unconditioned spaces, like the garage and the lanai. The basic concept of insulation is to create an insulation barrier between conditioned and unconditioned spaces so that it will slow down the rate of heat transfer between two spaces that have different temperatures. But, if you create an insulation barrier between two unconditioned spaces, like the lanai and the attic above it, the insulation doesn't really do anything because neither space is being temperature controlled. That is why homebuilders never install insulation in these locations.
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