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Insulation prevents heat loss as well as heat gain so the insulating techniques and levels remain essentially the same.
There can be differences in vapor retarder locations.
In northern homes the moisture dynamic is usually from the inside of the home to the outside. In northern homes, the vapor reatrder is located on the interior side of the studs to control moisture flow into the stud cavities where it can condense on cooler surfaces.
In southern climates, the reverse can be true, with the moisture dynamic from warm humid exterior air flows in toward the house.
Vapor retatrders often need to be on the exterior of the studs to prevent this moisture from migrating into the stud spaces and condensing especially when air conditioning is used.
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A significant part of heat build up is from radiant energy from the sun that enter through the glass on windows. It is essential to block a significant amount of the radiant energy that comes through windows. The home carries a large thermal mass and the marjority of the cooling costs come from the need to cool heat build up in the mass not from penetration from the outside. There are some new aftermarket shades that accomplish this as well as some sophisticaled glazings on new windows that tend to help.
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