Is the testing done on the freshly exposed face of wood that has just been resplit in half?Pin type moisture meter.
A half-gallon is not pretty, but not horrible if that represents 4 cords of wood burned. Still, it does sound like it may be possible that air is leaking into the chimney from somewhere. Has the chimney been inspected for any cracks, missing mortar, unsealed takeoffs, etc.?I have been concerned that extra air was getting into the chimney and cooling things down, so the last couple of years i put tape around the clean out door to make sure that was sealed up.