Whether it's 1500 or 3000 sq ft, a wood gasification boiler makes lots of cent$ and is very convenient with reasonable storage. My pole building shop is 1500 sq ft, "well insulated": 2" foam perimeter and under the floor, 6" fiberglass in the walls, 12" plus blown in fiberglass in the ceiling. With pex in-floor, constant 61F temperature setting, never burn more than once (about 6 hours) every other day with the Tarm Solo Plus 40 (140,000 btuh rating) -- that's what 1000 gal of storage allows. The wood is pine and aspen, about 4 cords each winter, in a cold north-central MN climate. The 1000 gal storage, a re-purposed old LP tank, added $900 to the cost.
A wood stove also makes lots of cent$, if someone is around to keep it fueled, and either my wife or I am around to do this. Our house also is 1500 sq ft, heat with a wood stove in the living room. Same amount of wood as used in the Tarm, nearly all aspen. Main living area is kept about 70F, bedrooms cooler. Outside temperatures range into the -30'sF for brief periods during the winter. Average January temperature is around 0F.
As others have said, "damping down" does not really work for wood, unless it is a sophisticated control system, and then only to a limited extent. The Kuma Vapor-Fire forced air wood furnace does this very well.
Cost: local markets govern, our wood is from our land, "free" with lots of labor to c/s/s 8 cords every year and start each heating season with 16 cords on hand, 8 cords to burn the current heating season and 8 cords for next year, well-seasoned wood. Work the math to get the answer. My alternatives were electricity, currently about $1600 year for each of the shop and house, and about $1300/year for each with propane at $2/gal. Both electricity and propane are subject to price increases, and the propane price has been quite volatile (up to $6/gal last winter).
A decision to burn wood is also a sustainability decision. Wood is carbon neutral and sustainable. It also is clean burning in an efficient wood boiler/stove.