Time to ask for help
 

well, its certainly possible this is the culprit. bruce, does this simply involve punching a hole through an exterior wall, or is there some sort of mods to the furnace. either way, i should probably do it i think to eliminate the possibility.
shane

Time to ask for help
 

Yup, just cut a hole in an exterior wall and shove a fresh air hood through. That's it!

There are also cool air traps that can be used as well to keep air from pouring in and causing a nusiance.

Gimme a call for info