We’re wondering where to place two ductless mini-splits in a
two-floor farmhouse addition (of a second floor) that now will have
one big double-height cathedral room. Any best practices based on this
floorplan?
We are heating-dominated and want to place
these with that in mind. House stays relatively cool here with two
mountains on either side, and a creek running past, despite full sun
from 11-4:30 in the summer.
This house used to be only
one level. At that time, we ran a 15K BTU Fujitsu unit and a woodstove
and were fine. Fujitsu struggled below freezing to do the whole house,
but was perfect for bringing 40˚F up to 68˚F without the woodstove. All
the new walls, including in the great room, will be double 2×4 stud
walls with 1/4″ air gap, rockwool insulation. 18″ of rockwool to go in
attic.
In the roof plan you can see that the “false
dormer” part of the house will have 18″ of blown rockwool attic
insulation, and the steep cathedral portion of the roof will be 18″ of
spray foam.
L1 floor in the crawlspace will be flash and
batted with 6″ rockwool batts. Thinking a vented crawl that’s not part
of the thermal envelope.
We have not determined if a solar attic fan would be helpful or not.
Thanks
for insights or best practices! Wondering if this is a paid job for a
Manual J contractor. In which case, I’m open to suggestions.
Thanks!