We had insulation blown into the space over our lanai after having a mini-split system installed. Approximately 300 sq ft.
The company we used had a minimum charge (I think around $275) and I am sure other companies have that too.
So at the same time they "refreshed" the insulation all through the attic space - although not over the garage.
The result has been that even though we use the lanai air conditioning almost every day the electric cost has dropped slightly. We compared June thru December 2011 (no lanai a/c) to June thru December 2012 (after a/c install).
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