Hello All -

This is my first winter in my new home and there is an anomalous heating
issue.

The house is colonial with a bonus room over the garage (Finished Room Over
Garage - FROG in some areas). We have a high end furnace with hot water
baseboard heat. The first floor zone works great, but the second floor zone
has frozen on us each time it got below 10F. Fortunately we have plastic
pipes, but I don't like having heat. My opinion is that there is a pipe in
the bonus room freezing between furnace calls be the second floor
thermostat. The thermostat is in the hallway and is sometimes satisfied by
the first floor heat rise (particularly when the fireplace is going). This
results in the second floor heating system sitting idle long enough for the
pipe to freeze.

I don't want to tear the house apart now (I'll need to do something in the
spring) and don't want to run the upstair thermostat at 75 all winter.

I believe I can largely solve the problem by putting some anti-freeze into
the pipes, but my google research yield mixed advice. BTW, I have plastic
pipes.

Any help would be greatly appreciated.

Thanks
P

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