If you desire....someone will create an outlet for you to dump cash into. You can buy a TT load of coal a year and utilize the technology that we have had for 100 years and still never come close to breaking even in your lifetime with many of the "new green technologies" we have today. I do admire your resolve in searching for the "Magic Bullet", and if you find it, share it with the world. You have in your possession the most cost effective solution for your family's heat and hot water, so hook it up, relax and enjoy. I guess folks here all want to see pictures, so don't forget that.
Your postings have sure gotten folks thinking, and that is an excellent way of making progress. I live where we have all sorts of folks from the cities with 'impressive degrees' and 'worldly ideas' for their second homes, so geo, high temp solar extractors, $250,000 solar arrays, bio boilers, super insulated homes are all over the place.......while the rest of us use wood, pellets, oil, propane, and a few old timers who burn coal.
Not because I'm an old timer, but I would advise you to do a competent install of your AHS, and enjoy the comfort year-round.
With all the uncertainty in the middle east, the only certainty is that it will never change in our lifetime.
If you were building a new home, you could incorporate many new features to make the heating and cooling much better, but we unfortunately live in a 'wooda, coulda, shuda world. Hook it up, spark it up, enjoy. .....sounds like a Cheech and Chong moment.....