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About the only way it can be used as a suplement is if the combustion chamber air id brought in from outside and no inside air goes up the flue. More for mood than heat.
I had a fireplace with a large fire box that let all the heat go up the flue but... my parents had a small firebox and it would burn you out of the house no need for the furnace. The only other thing you could do is add a wood stove to the box and that would definitely supplement the furnace.
Definitely get it cleaned though. nothing is worse than a chimney fire.
Either of these would be an improvement over the standard fireplace with a simple spark screen, and still provide the ambiance of an open fire. Looking forward to lighting off the stove in my house for the first time this season...any day now...!
The only thing I can offer is a suggestion on fireplace safety. Ashes don't go in the garbage. I've known 4 or 5 people that have burned their houses down when the threw out "cold" ashes. I'd recommend getting a metal can of some sort to put the ashes in. Do not store it on a wooden floor.
And yes, that's basically it. The doors keep the room heat from going back up the chimney, and with ones like I linked to, they improve the efficiency by making the airflow controllable, if installed properly.
If you're going to do an insert, I highly recomend a pellet stove. We heated with a wood stove for years, then we ran out of trees that needed to be removed. The pelet stove is much easier than the wood stove. Just dump a bag of pellets in, push the button and it will be pumping heat out in about 5 min. The fire box does need cleaning about once a week, but thats simple. A more thorough cleaning is needed some times, we just had to tear ours down and clean it out completely, because it was so dirty that it would push a cloud of smoke into the room from exhaust passages plugging with soot.
Depends on how handy you are at that sort of thing. If you've got any experience with construction and home repair, you should be able to handle it, but I'd really see what the recommendations by the manufacturer are for the unit you select. Do a Google search for "Fireplace Doors" and click on the image link to select a design you like. Should be able to find a local dealer that way as well.
Would have to hirte someone to install glass doors?
A pellet stove is a nice idea, but I'd have to bbuy pellets, I can get wood for free.
true, and the price for a pallet has gone up a ton since last year, supposedly because of fuel sur charges, the stove shop we buy from gets their pellets out of canada.
We don't really use our fireplace for primary heat though. Not even secondary. Mostly just for the mood, and even then, we got those little presto logs.
Actually though, just a few days ago, I noticed our house was a bit chilly, and we had a bunch of junk mail and newspapers piling up. I wasn't about to turn the furnace on to feel heat in a half hour, I was cold now. So up in smoke went the junk mail and newspapers. That's how I get rid of all of our sensitive documents.