Mikepier wrote:
I have been living a year and a half in a 4 level split with a hot air
furnace with the addition of A/C. There are return ducts on each floor
including one in the basement at the floor near the furnace. This is
the only return grille that can be open or closed. The rest are fixed
open.
Someone had marked the grille "open for cooling, closed for heating" .
But I think this is wrong. I believe if you open the grille for
heating, it will pull down the warm air to floor level in the basement
making it more comfortable.

My guess is it is to be kept closed for heating to prevent a venting
problem due to a drop in pressure around the furnace and pull CO into the
system.

I don't think I would like the idea of having a return of any kind near
a furnace, but I really have never looking into the question of weather is
is proper or not. I don't believe it would be safe if it were possible to
close off the area where the return and the furnace were located.

The other issue might be that someone wanted to draw in the cool air
from the basement where it would normally settle and send it through the
home upstairs to help cool it during the cooling season. They did not want
to bring in the cool air during the winter, and would rather leave it in the
basement.


My supplys in the basement are at ceiling
level, and since I opened the return grille a few days ago it seems
that it does get a bit warmer down in the basement.
The same might be true for summer. My supplys in the house are at
floor level, so the A/C might not cool as well as if the supplys were
in the ceiling. But if I close the return grille in the basement
rather than keep it open, I think that would help the return grille
on the top floor draw more cool air upward, rather than get sucked
down into the basement.
I was just wondering what everyone else did if you had a similiar HVAC
system.

--
Joseph Meehan

Dia duit