Hey Johnny...
I am not sure what your winters in KY are like, but here in Minnesota my humidity levels will soon drop below 40% in my house. I always keep all of my solid wood acoustics out on stands in my music room untill the humidity levels go below 40%. Most of the major manufactures and luthiers out there will say that humidity between 40% to 60% is safe for your guitar. Let it go above or below for any length of time and your guitar will suffer without some help.
First, if RH drops below 40% (I use a $10 hygrometer from Walmart that has always been very accurate) start to keep your Martin in the case if your not humidifing the room to at least 40%. My house gets into the low 20% range during our long cold dry winters here, you probably will have an eaiser time.
I have 4 solid wood acoustics that I maintain the humidity levels on during winter. It is a weekly job that I don't mind as it keeps my babies in great condition. I always keep 2 home made humidifiers in each case and rewet them about once a week. I use the small Glad plastic containers and ziplock sandwich bags along with some large sponges I cut into strips. Just poke or cut small holes in the plastic top on the Glad containers or snip a few holes into a baggie and put a damp (not wet) sponge in each one. Each one costs next to nothing but they do what is needed. Depending on the case, I keep one at the headstock area and one at the neck heel.
I also use either a Bass/Cello size dampit or a Planet Waves humidifier that sits in the soundhole in each guitar while in the case. I have measured my cases with my hygrometer overnight and using my system it keeps the RH between 40 and 45%. I personally like my acoustics tone best when the RH is close to 40. They seem to sustain better and just have a really sweet tone. Too much humidity and they can get muddy. Too little and you will get cracks that you can see as well as interior braces getting dried out and possibly cracking. In reality, it is a 5-10 minute weekly job that will keep your Martin in great shape. My 1993 Taylor 612C has been getting this treatment since I got it new back then and I have never had to adjust the truss or have any major repairs completed. My 1964 Gibson LG1 I got a few years ago never sounded better after getting properly humidified and my 2005 Gibson Advanced Jumbo will have a long healthy life as long as I keep humidifing them. Hell, I even keep my beater 1969 Framus 12 string which was cracked and broken when I got it, in the case and humidified since I fixed her up.
Here are a few shots of my humidifers. They are a breeze to make if your cheap like me, or go to any guitar store and pick up at least a soundhole humidifier for your Martin. I would assume in Kentucky you might not really need more than that.