On Mar 22, 11:33*am, "S. Barker" wrote:
sight glasses are only accurate above 70 degrees. *under that, you'll see
vapor.

I guess I'll have to wait another couple of months before I fire it up
and see.
I know last summer I did not see bubbles when the unit was running and
the house was ice cold. So hopefully those bubbles I saw don't mean
anything.