There is much truth to the above two comments from EnglishTeacher (on the Bay!) and tekguy.
Look at English Teacher's avatar:
The stove is near the door.
There is wood storage under the stove.
There is more wood storage in a neat and attractive bin next to the stove.
The tools are neatly organized on the hearth.
The entire presentation is both functional and attractive.
There are not miles of pristine white carpet in between the door and the wood stove to foul up while trying to tend to the wood stove.
Along the same line of thinking, short distance to door via which ash can be transported out of the house.
Nevertheless, I'm betting that there is at least one household vacuum nearby via which any mess tracked in can be cleaned up without a lot of fuss and bother.
A good ash vacuum that does not belch soot out of its back end will go a long way toward easing legitimate fears about mess.
I've been married for over 30 years.
I *do* see messes and dirt that my husband does not see. My higher sensitivity to messes of all types can drive both of us bat poop crazy with each other. Nonetheless, my husband is plugged into the order that I bring to living spaces and life itself and he appreciates it. The tidiness and organization in the household and in our life together brings stability and peace of mind on which he depends. As much as my drive to keep things neat and organized can drive him nuts at the moment, the overall aesthetic and ambiance contribute much to his sense of well-being. And I'm not exaggerating with that- the whole "morale" thing about living in a clean, organized environment is real.
There must be some sort of neurological or psychological or just plain logical pathway that explains the difference, but I can see the direct correlation between a bunch of isolated, smaller messes and an entire messy existence. My husband only sees the little mess right in front of his face at that precise moment, if he sees it as a mess at all. Most likely, he doesn't see "mess," he sees "process," and in his mind, it's only temporary, until whatever problem on which he is working at the moment gets solved. My issue with this is that a lot of little messes (processes, disruptions) make for a messy house, which makes for a messy life. Also, our perception of "temporary" is different, with different time tolerances. His "temporary" is until it gets solved, whatever it is. My "temporary" is until one's attention is pulled away from that project for that moment, for that afternoon, for that day. If the sun has to set on it, it should be stowed away for the night, for the sake of the project itself (no missing pieces, no scattered pieces, no cat hiding pieces) for your own mental health (put it away, give it a break, give your brain a break) and out of consideration for everyone else living in the house (I don't want to see it in pieces, I don't want to trip over it or have to do my work around it.)
If wood heating is a "temporary project" that disrupts the house from October through April of every year, leaving a wake of bark, leaves, tracked in dirt and tracked out ashes in its path, your fiancee may be reacting to a sense of disorder that you see as a process.
I'm betting that it's more than getting up to fiddle with the air control and/or not simply stepping up to the thermostat and turning it to 80'F.
And if those two things are *all* that it is, yeah... there's a lot of compromise involved in marriage. The thermostat and the air control on the wood stove are the least of it. DevilsBrew mentioned that heating with wood is not a hobby, but a lifestyle. He is absolutely correct, and in our situation, at this moment we are heating with wood pellets. It's a lifestyle and it's at least half the bother of heating with cord wood. If she doesn't like fiddling with the air control on the stove she's not going to love fiddling with the log splitter.
Happy Wife = Happy Life. That's true.
Tekguy's point about paying bills is HUGE. My husband pays the rent. I pay the bills. I see where the money goes and why. Don't ask me why, I don't know why, but in the majority of relationships to which I am close enough to know this detail, one person usually handles the bills. The couple may (or may not, depending on their personalities and their own arrangement) handle the budget decisions together, but usually one person handles the bills. This means that this person has his/her finger on the pulse of the money flow on at least a monthly basis.
There is a psychological weight to being that person who "writes the check," the one who puts it down in black and white, that is inescapable.
If your fiancee is willing to pay significantly more money every month NOT to have a wood stove in her house- then if you want a wood stove, you are going to have to meet her on that field, find out why, and address those issues.