01/25/2026
High-efficiency 90% furnaces produce condensation.
I know you are wondering...do I have that? Simple check. Is the flue exhaust pipe exiting the furnace 2-3 inch PVC or metal?
If it's metal...you have an 80% furnace.
If it's PVC...you have an 90% furnace.
When it gets really cold outside, that condensate line can freeze where it exits the home. If that happens, your furnace may shut itself off as a safety precaution.
If this happens... please don’t panic.
You can usually fix it by:
🥵Using a hair dryer to slowly warm the PVC drain pipe
🥵Or clearing the condensate hose if it’s frozen
Once the ice melts, the system should resume normal operation.
This is common during cold snaps and doesn’t mean your furnace is broken.
Grab a hoodie and your favorite blanket.
Stay safe. Stay calm.
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