On Wed, 17 Jan 2007 10:52:48 -0600, Chris Friesen
wrote:

Tony Hwang wrote:
Do you know how cold it can get in Calgary?
How about -35C with wind chill of -50C-ish?
Not all the time but there are days like this.
Here in old neighborhood house to house distance is ~10 feet,
in higher density new neighborhood it's ~8 feet.

I live in Saskatoon, so I feel I can comment based on similar weather.

At -35 (windchill of about -45) my condensing furnace did not cause
frost on my car ~6ft away or on the window directly above the exhaust.
Also, my neighbor's condensing furnace didn't cause frost on my wall
which is about 6ft from his house.


You're more likely to get frost deposits when the air temp.
is rising to right around freezing, and the surfaces are
still colder. at -35F, water vapor will freeze too fast
to deposit on surfaces.

I still think I'd put the furnace in anyway, and
worry about sticking a baffle or something
on the output only if it proves to be a problem.

--Goedjn