Problems with 90% furnace in cold attic - how to solve?

January 13, 2020

Hoping for advice on the best replacement for our attic furnace - it broke due to a cracked heat exchanger in cold temperatures. Two well-respected HVAC companies have given very different advice on how to prevent the problem in the future, and we don't know who to believe!

1. First Company: Told me to get an 80% furnace. We don't want to do that, since we're using expensive propane heat. If we want to get a 90%+ furnace, they said they'll need to build a mini insulated room around the furnace to keep it from getting as cold as the rest of the attic.

2. Second Company: Said it is fine to get a 90%+ furnace. They will install some sort of heating source inside the furnace and along the drainage pipe to prevent freezing. The first company has never heard of using heating sources in this way before.

Thanks in advance for any guidance you can provide!

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