The area below is partially completed. Notice the foam goes on just under the roof deck making the attic area "conditioned" too. Usually the pink stuff or blown in stuff goes along the attic floor making the area between the roof and the attic floor either very hot or cold depending on the season. These types of systems need some type of ventilation for the attic, either an attic fan (that uses energy) or a ridge vent system on the roof that depends on natural air flow. Even with this, the attic space still will have a much lower or higher temperature than the living space. With the spray foam, the house is totally air tight. It will also keep out dust, sand and little critters!
In these southern one story homes, the HVAC systems are usually installed in the attic space . With the typical system, the HVAC has to fight the hot or cold to get the interior of the house comfortable, resulting in moooore energy usage! My unit will have to work less. Also, you'll notice the wrapped duct work in the attic. It too will not have to fight extreme temperatures to deliver comfortable air to the living areas.
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