So far as the heating system, I have had success up to now (just installed wood stove) heating just one room at night (bedroom) or using an electric blanket when temperatures are not too cold. Then keeping the whole house heat *real* low but at a minimum when it is cold as heck. I warm up the house in the morning.
I would take a look at new efficient heating systems which can be zoned and have the ability to turn off heat in unused rooms. Might cost more now, but would probably be worth it in the long run.
Also there are Rinnai natural gas heaters which are so efficient, they just require a plastic pipe through the wall for exhaust venting. Maybe a few of these installed in key rooms would be cheaper than a new central system? Links for Rinnai and Energy Star (discusses other more efficient heating systems) below.
So far as a wood stove, I just installed one myself and it cost upwards of $3000.00 including a new chain saw. (My other chain saw decided to break after I ran up this large bill of course!) I live around a bunch of wood mills and can get a lot of wood free or at a low cost, so well worth it.
I had my natural gas turned off - told them I was using wood this winter as their prices were too high.
And I am enjoying it each time I stick a piece of wood in my wood stove. I utter a few foul words directed toward certain large oil and gas corporations.... Worth every cent of that $3000.00 if you ask me!
Probably not unless it is really poor efficiency. What wil a 10% gain save you?
I'm having one put into a building we lease out and it will be $6700. Depending on size, yours may be a decent price.
Depends on the price of wood. Right now in central Mass it is running $185 to $225 a cord. Boston often higher. Much higher. If you can get wood cheap or free, don't mind the additional labor, and the mess, it can reduce your gas bills. New stove installed can run $1500 to $3000 or more. You have a large house and have to circulate that heat from the room with the stove to the others so that may take some ingenuity for maximum effect. At the price of wood, I'm using oil again this year even at 2.36 a gallon.
You might have local professional check out your current installation, and maybe look into a flue damper. Such person could advise much better than a random cybercitizen as to cost/benefit of replacement, so long as that person is not angling for a sale.
Consider also zoning the heat, cutting it down where not really needed. And a clock-thermostat.
Insulation is only effective with good sealing. Sounds like something that'd have a good payback for you.
Woodstove can work great, _if_ you have access to cheap/free wood, don't have to make major investment to install, and don't mind the work. Kinda late now for this year. For future, you might investigate pellet stove.
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