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Originally Posted by retiredguy123
That is not correct. Yes, hot air rises. So, you may measure a slight temperature difference between the floor and the ceiling. But, more importantly, in the summer, the temperature in the attic will be over 100 degrees, while the temperature below the ceiling will be about 75 degrees or so. The heat transfer will be downward from the hot attic to the living space, and will cause your air conditioner to run more often. In the winter, the attic will be colder than the living space and the heat transfer will be upward from the living space to the attic. In both cases, you want to slow down the rate of heat transfer between the living space and the attic. The more insulation you have between the attic and the conditioned living space, the slower the heat transfer process will be and the less heating or cooling you will need.
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I worked for a worldwide insulation manufacturing company for 35 years. The code in FL is R30. There should be a sheet just inside your attic entry listing the amount of insulation installed when built unless some has already been added. I have about an R50 in my attic and I can tell you that you will feel and see the difference. Just be sure they install fiberglass and not cellulose which is fire resistant, treated paper. A great company and customer of mine was Suncoast Insulators in Ocala. They do mostly commercial but will do residential in TV. Very reputable honest people. Call them.