KD firewood??

[nickel plate]

What would the moisture content of KD wood be? If it's less than the regularly humidity the wood would just get "more moist" when you pull it out of the kiln and put it into the woodshed would it not?

By Western lumber industry standards "KD" (KILN DRIED) represents a moisture content not to exceed 12%. This process is usually seen done only on the upper grades of North American lumber, C&BTR DF, VGDF, etc. The "KD" will be noted on the individual board's grade stamp. By the same set of standards, the term "S-DRY" (SURFACED DRY) represents a moisture content not to exceed 19%. Typically seen on framing material that would otherwise become unstable due to twisting if left alone to dry on it's own. This process is usually done on the Spruce, Pine and Hemlock-fir mixes cut for wall studs, plate and other framing material.
I fail to see any correlation between furnace dried finished upper graded lumber and common fire wood. One will however pay a premium for both.
There probably is no standard for drying to a specific moisture content in the firewood industry so this sounds like a tag title to artifically enhance the product. If no standard, I can then rent out an unused-abandoned lumber kiln, shove in as many cords as possible and plug in a household room heater for 10 seconds and produce kiln dried fire wood.
Generally each state has governing rules pertaining to the SALE and deminsional size of a cord of firewood and not the PRODUCTION of firewood. Check your state for drying rules i.e. "seasoned" vs. Kiln Dried.
This may be an agricultural issue-insects,etc. then the state's AG department may be the mandate and if so, there should be a tag/sticker on the product stating the same.