If your home already has ducts running in the attic the simple solution is to keep using the old system to pump treated air into the newly finished attic room.
Finished attic hvac.
Consider whether the old system is powerful enough to cover new areas without losing efficiency though.
The type of ventilation or roof vent that you ll need depends on your home s construction and the details surrounding your attic.
If you don t have enough height you ll have to raise the roof line and that adds a lot to your construction costs.
Sometimes the hvac system winds up in the attic because it s the last thing on the home designer s list.
To find the answer you can hire an inspector to inspect your hvac system.
Attic ventilation systems also work together with your insulation.
Every attic is different but a few established norms and practices will guide your renovation.
This isolates the attic from the rest of the home which means the attic isn t part of the conditioned envelope.
That s measured after you finish the ceiling.
By the time the hvac unit gets planned putting it in the attic is the only thing that makes sense especially cost wise.
In many homes the insulation layer in the attic is along the floor.
Enforcement varies but codes typically say that at least half of a finished attic must be at least 7 feet high and that this area must be a minimum of 7 feet wide and 70 square feet.
Attic hvac units are potentially inefficient.
Building codes vary by location but most require at least a 7 foot clearance for attic expansions.
Increase or move insulation.
Need more headroom in the basement.