"CL (dnoyeB) Gilbert" wrote in message
...
CBHVAC wrote:
"CL (dnoyeB) Gilbert" wrote in message
...

My furnace has a high a medium, and a low connection on its blower. I am
wondering which of these is on with the Heat, and which with the A/C? I
heard of two speed, but never of 3. My furnace is rather new and has an
exhaust blower as well.



3 speeds is old news....been used for years....now 4, or 5 are common,
and with VS units, of course, 16 or more.


Its NOT to get more air into the home..its so that you can during
installation, to overcome or to reach the proper static pressure to
maintain proper operation of the unit.

Normally two speeds are used....the higher of the two for cooling, the
lower for heating.


Im trying to wire in an auxillary blower for the winter months. Deciding
between splicing in to existing 120v wiring, or adding a relay inside the
furnace and splicing into 24v wiring somewhere.


Ummm...why?
If you do that, there is a possibility of effecting your heat rise in a
negative manner.



because my bedroom is cold because it has large glass window and all the
heat exist through it. During summer it stays cool if I keep furnace fan
on 24/7.

Was the window added AFTER the unit was installed?

If not, either way, normally what you have in a case like that is a duct
issue, NOT a blower issue.
Either you are undersized on the supply, or simply required more than one
for the room, or its one of the rooms farthest from the furnace.
In that case, a simple bit of balance to the system might work wonders for
you.



--
Thank you,


CL Gilbert
"Then said I, Wisdom [is] better than strength: nevertheless the poor
man's wisdom [is] despised, and his words are not heard." Ecclesiastes
9:16