I am hopefully going to be buying and putting in a new ZC fireplace in the spring. I like the northstar a lot but it has an air cooled chimney which I hear is bad. Everyone tells me to get solidpack or class a but you can't with this unit. I also like the cost of air cooled. The unit will be in the basement against an outside wall with the chimney running straight up in an inside chase, into the attic and out the roof. Sometime we get artic cold weatherfor a few days to a week, say -10 or so. Generally all winter is around 0 or above. Will I have condensation issues and too cold of flue gases or are air cooled generally o.k. with this climate? The chase and basement are insulated too.