c_shah wrote:
Furnace fan can be set to "auto" and "ON", I ususally keeps it on the
"auto"

I think when you keep the fan "ON" the fan will run contineously while
on "auto" it will start and stop automatically as per the need.

Does anyone know which weather condition you should keep the fan to
"ON"? Thanks in advance.


The only times I've left mine on "ON" were during parties in the winter
when I'd have many guests over. The body heat generated by each guest
is enough to raise the temperature of the room a few degrees above
normal, making the furnace not run at all. After 3-4 hours the main
floor where all the guests are becomes 2-4 degrees hotter than the rest
of the house, and the air starts getting a bit stuffy from all the
people and the lack of air circulation. Often the windows will start
to fog up from the extra humidity (from all the cooking, guests talking
and drinking, etc.)

I leave the fan on ON to get better air circulation during those times.
The whole house stays at a much more comfortable and constant
temperature, the air is less humid and stuffy, and the windows don't
fog up.