Published on May 18th, 2018 | by Henri0
Ice forms around furnace flue
Q. I am having frost and icing up problems. My furnace is two years old and several HVAC guys out and a contractor have not been able to figure out the problem. I am wondering if the furnace was installed correctly.
The problems, in a nutshell, are:
- The flue from the furnace is icing up on the roof.
- There is frost forming inside the house on the ceiling in the second floor.
I hope you can help.
A. Efficient furnaces should not have their exhaust vented through regular chimneys or a new chimney going through the roof. The gases they emit are cool compared to older, non-efficient furnaces and, traveling through a cold chimney and cold spaces, they freeze up.
These newer furnaces should be vented through the rim joists of the first floor.by