NSMaple1
Addicted to ArboristSite
I echo NSMaple1. Ground source heat pump for main heat/cooling, but if you go this route get a contractor that knows heat pumps. They typically need a smaller sized well pump to run longer when cycling, and multiple bladder tanks for increased water reserve to reduce cycling of the well pump (more mechanical room space). There are many kinds of heat pumps, air to air, ground source, etc., and different sub-groups in those. Air to air heat pumps are not efficient in colder climates. You probably do not want one. (If you have city water then no heat pump .) A supplement to that could be anything you choose, and as a supplement, you can heat with wood are not tied to it. Huge plus in a world of changing circumstance, job travel, injury, resale, kids with asthma, etc. Excessive creosote built up can be from several things, such as colder exterior chimneys, poor draft, and poorly seasoned wood, or choked down fires. Regardless, the chimney/roof line and access to it in winter, will be a consideration for cleaning/inspection. Your going to have to get up there with a chimney brush several times a year, unless you go the outdoor boiler route. Trukn2004 suggests flue stainless, which I second. There is triple wall stainless, in which is insulated between the inner and middle wall, and an air space between middle and outer wall. Another thing to consider, is an outside air supply for a wood stove for better flue draft in a tightly sealed house. Plan it in your home when building, and choosing a stove. Interior design and air flow will have a lot to do with your heating choices. If your plan is to save money by heating with wood, first check with your home owners insurance agent to see if you will be paying in some cases much higher rates, and if that is true with outdoor wood heat as well. Have fun picking and choosing from all the options.
I was speaking of air source heat pumps - mini-splits to be exact. Arkansas should be a good place for those, not exactly an arctic climate. I looked into geothermal for my place, wasn't worth it for me. $20k for the geo end, plus likely $10k more for system retrofits inside the house. (Existing is hot water baseboard). I also know some people around here that took the geo plunge & ended up with power bills that were higher than they were expecting. That might come down to expectations though.
I think an OWB would be down my list of choices pretty far if building new in Arkansas. Unless, perhaps, if heating multiple buildings at once. But even then I don't think the capital cost and amount of wood you'd need to put up year over year [vs. what a nice efficient (and much cheaper) wood stove would use while supplementing] would be worth it in that climate. To each their own though.