I made a kiln for mason jar kilning from one of these:
And added a second heating pad to put on top of the jars. I use boveda packets to hold moisture and I have had great results with 6 weeks at 122 degrees. I air out the jars to add oxygen periodically and have had no mold growth. It is very easy to determine the stage of fermentation with this method by smell as the volatiles are concentrated when you open the jar.
For air cured, I ferment them for 6 weeks, airing out as much ammonia as I can every week or two, then I let them get bone dry to drive off all ammonia before rehydrating to store. This seems to work well and takes very little space/is affordable enough to experiment with without a big commitment.
Recently I have been spraying Va and Connecticut Broadleaf with half vanilla bean-infused rum and half water before jar-kilning. So far the Broadleaf is some decadent stuff, perfectly suitable for pipe/blending, it is amazingly smokeable. I am still waiting on the Va to see how it affects that process as I prefer my virginias kilned. The rum-kilning seems to affect the pH in a desirable way for the Broadleaf.
Yes for temperature but no for oxygen. Here is the rub! Breaking down air cured tobacco to mellow for smoking requires oxygen. Elevated moisture and temperatures do help but if you include oxygen then mold will grow. The solution is to have the temperature high enough to suppress mold growth with moisture and oxygen present. A well designed kiln is perfect for this. Aging with enough oxygen at lower moisture levels also supports this breakdown. Here with oxygen the balance between moisture and temperature will suppress mold.
Flue cured tobacco is a different story. I certainly can be improved by the oxidative processes but it’s not as necessary and having most of its enzymes destroyed by the heat of its color curing not as effective. This is where an environment with no available oxygen can affect change and with a higher sugar content an anaerobic environment is where flue cured tobacco can improve dramatically. With no available oxygen moisture and heat can be applied with little concern for mold. There are ideal temperatures and moisture levels for supporting microbial activity but time can negate their importance. There are also temperatures that will destroy microbial life which is what exposure to oxygen can do as well. High enough temperature can also destroy cellular structures in tobacco which can be a good thing. There are many kitchen gadgets that can be used in various ways but I don’t like the idea of an appliance being on for months.