Cost Of Conditioned Attic Vs Unconditioned

The roof deck in an unvented attic must be exceptionally airtight.

Cost of conditioned attic vs unconditioned.

Attic hvac systems save space. Code requirements vary across the country. Adding conditioned air seems like a good idea though i suspect you could still have stratification depending on how effective mixing is and how frequently the system runs. If you are going to condition more space than you can live in it is going to cost you more money.

So perhaps the cost savings of cellulose versus eps will be somewhat reduced due to needing to place two to four inches of eps or polyiso foam directly on the top of the attic floor slab under the cellulose. Increases the volume of air in the house that gets heated. The thermal boundary can be at the ceiling plane leaving the attic space above uninsulated and vented or the thermal boundary can be located at the roof line creating a sealed insulated conditioned or semi conditioned attic space. In my opinion a.

The irc has permitted unvented conditioned attics since 2006 with certain requirements. The acceptance of unvented conditioned attics continues to grow among builders and building officials. Creating a conditioned attic is expensive. If the insulation above the attic floor is cellulose.

The loss of energy efficiency means some designers choose to move the ductwork into the conditioned areas of the home and leave the attics unvented. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. Unvented conditioned attic this has been discussed numerous times before but i will repeat what i think are some of the critical points.

In warmer climates unvented attics can prevent the condensation that occurs on ductwork in some vented attic spaces. In a roof attic assembly the builder has two choices. One possible solution to the humid attic problem is to install a forced air supply register and perhaps a return air grille in the attic. And when in the day.

Well mainly it s a way to save space. So why put an hvac system up in the attic at all.