I live in Florida and I need to store food products in my garage. I need to keep my garage cool as I plan on storing food products in my garage. I need to keep the temperature in the garage at a steady 78 degrees. Is it more feasible to run the cooling from my exisiting central air or to get an independent system for the garage? Will I need to sheetrock around the walls inside the garage and or to add insulation??? any help will be greatly appreciated…