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You don't say if your furnace has a fan or if it's gravity-based (no fan, uses the fact that hot air is lighter, typical of very old houses). If the latter, then switching to a furnace with a fan...

There is a small chance that the thermostat or the wiring is bad, but more likely something is wrong with the furnace. A simple check you can make is to pull the thermostat off the wall (there may...

The motor in one of my 35-year old Trane air handlers recently
Blew. It looked quite old. I figured it would be easy to replace
It just by matching the specs. Unfortunately the new
Motor runs...