What are the considerations for putting heat/AC air outlets in a ceiling.
One room on the 2nd floor in a house (addition) has floor joists running
the wrong way to put ducts in them. One option is running a duct in the
attic (insulation not a problem) with outlets in the ceiling. The
mechanic says I haven't seen it done." The other option is adding a
soffit in the ceiling corner of a 1st floor kitchen (not desirable) with
the outlets in the floor. Location Minneapolis, system includes AC. The
rest of the 2nd floor and house has ducts in the floor.
Booster fan appropriate?
Would the system balance for both heat and AC?
The problem is it was the HVAC mechanic, with many years experience and
working for a moderately large contractor, who said it. I know ceiling
runs can be done but don't know what the trade-offs are, particularly
with mixed ceiling and floor. IMHO the comment raised questions about
the mechanic. And unfortunately not the only thing that raised questions
about the mechanic. (It isn't my house. I'm looking for advice for the
Thanks for the replies.
Running ducts in an attic is not unusual in NJ. As for a booster fan and
balancing I think only a qualified engineer could give you precise
information. Maybe a good HVAC installer good give you a reasonable idea
about what to expect.
You could install a ceiling fan in the room to mix up the air.
Ceiling vents work a little better for A/C than for heat, as opposed to the
rest of your vents ( low ones) which work better for heat than A/C. Hot air
rises, cool air sinks, you can figure out the rest :-)
Both will get the job done though as long as you have adequate volume and
velocity, my house has most of the second floor vents in the ceiling too and
it's fine. NW NJ here, warmer than your climate but we do get down to single
digits a few times each winter. You might have to adjust a register or two
or at worst a damper when going from heat to A/C but that's about it.
More important is to make sure you have adequate returns in all areas,
without them all the supply air in the world won't do much good. That was
the big problem with my house, I had a very uneven temperatures, especially
with A/C until I added new returns in all the upstairs rooms and the top of
the stairs rather than counting on the airflow under the doors and then down
the stairs to the returns on the first and second floors.
"bud--" < firstname.lastname@example.org> wrote in message
This thread has been quite educational for me. I live in the south and
since our major load is AC, I would guess that that is the difference,
but I have not seen air registers on the floor in a house. The only
place that has registers on the floor around here are mobile homes.
ALL of the registers are on the ceilings around here, unless there is a
situation that makes that less workable, such as vaulted ceilings. They
are then placed very high up on the wall.
I can guarantee you that it will work for you due to my experience, but
as another poster said, you might install a ceiling fan as that helps to
circulate warm air when the heater is being used.
Get a good AC technician to design and install it.
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