Hi coaled sweat,
My chimney is about 25 feet, 8" stainless liner in a cement block chimney. House sits on a ridge. She DRAWS!
The barometric damper I have on the Newmac is the one that came with it...
I'll have to research thermometers - where do you install them and what makes would you recommend?
What's a "stack damper"?
The oil furnace automatically fires up when the other cools off to a certain point - disabled person in the house who cannot walk, let alone do stairs to the cellar - so must keep the oil on standby always when I'm away.
This summer I'm going to dive in to the firebox and wirebrush the heck out of the surfaces - lots of goopy wood creosote etc that may be affecting heat transfer...although the coal fire is a pretty intense heat right now - how anything even vaguely combustible like creosote can survive in there is a mystery, maybe its burned off since I last looked in the fall.
If I could find an old handfired steam or hot water boiler and some salvage convectors or radiators, I'd consider replacing the hot air units. It must be CHEAP (as in free if I remove and haul it away etc) . I enjoy the rituals associated with tending a fire, and always have, and would rather shovel coal than fix busted stokers. My grandpa told me enough horror stories of his school janitor days trying to keep old stokers going with cheap slack coal and breaking dozens of shear pins. Just give me a shovel