Ahhh. There you go MaxG.
"live in the process (daily)" as really the only way to learn.
I dusted off two old late1970's books about earth sheltered home building as superior in many ways. Not really. Not for where we have 122+ inches a year of rain fall. Build up, off of the ground! Up, above the wet soils.
One of these books has an excellent appendix chart of the annual heating fuel costs savings living-earth-sheltered, comparing using wood, versus fuel oil, versus natural gas.
WITH mathematical by % comparison charts.
The wood stove of the 70's maths used 50% effective wood low heat values to heat made inside of the houses by the then current woodstoves. Factor of .5
Still good comparisons IF that 50% is upgraded to real-in-this-century min 72% to 80% effectiveness of the spec woodstoves mandated here since the 1990's. Upgraded factors of .72 to .8
By two different stove/chimney up grades for my annual 200 to 250 days of needed woodheating I now use 40% LESS fuel wood annually 1996 to now.
Rural living in a very green growing climate is gasses and weeds mowing demanded.
In the 1970-1980's this took a ~180 days/21 weeks mowing season of at least 100 gallons of gasoline. 1990's by engine equipment upgrades I got this down to 70-80 gallons a season. By 2005 semi-retired using more walk behind mowing versus rider mower got this down to 50 gallons gasoline a season. And then mowing twice the area.
Post 2010 over the course of 3 years by going with the best world class Honda OHC engined walk behinds. Then a new spec Kawasaki V-twin ridermower, 2013 to 2016 I got this annual mowing fuel used down to only 35 gallons for that 21 weeks needed doing.
So far this year the .65 gallons an hour rider mower is still unused. Done some areas three times, other's twice, the last to be done now once over six weeks on only 1 1/2 gallons gasoline using the Honda engined power walk behind.
Ha! Sweating work still. 12 pints of gasoline. At least 12 pints of local crafts beers. Less fuel used is good for the atmosphere CO load added. But add in the out-of pocket cost for the sweats-out-beer-refueling and I am far behind in the pocket book!!
Diminishing Returns. Inputs versus Outputs ratios now gone unfavorable. Time to put the rider mower back to work.
(and asked why I must mow such a large area? the local powers-that-be have made it illegal to animal graze this down since the year 2000. grass weeds fire suppression, and noxious weeds department would then fine us. local powers-that-be strive to force our properties into high density suburban cookie cutter housing. of the once eight adjacent families who once cow/horse/donkey/goat graze managed - we are down to just three who have not given up to the banker/builder/real estate developers.)
2007 out annual Grid-buy electricity was an annualized 21 kW/hrs a day.
Now, today that is 12 kW/hrs per day. Grid storm/speeding-drunk-drugged-out, power pole taken out and we fall-back live handily on the 3-4 kWhrs I can generated daily on one GGE am willing to sweat-of-brow make and expend daily.
Taken years of doing it daily, living in these processes, to get to here.
Hey man. I do live this stuff each, and every day. Have for decades.
Simple systems, doing improvements step by step, can be improved just as well by try-three-times cut-and-fit as by the very best math proofs.
DO first. Observe. Honestly; without idealism as your bias; judge your results. Go a bit more, next time. Or: back off a bit, having found an adverse edge of possibility.
e.g.- compact florescent suck. Die early deaths, and dimout age too fast. Fourth generation LED's replacements work just fine and are cost effective.
A 1960's/70's Rainbow, FilterQueen carpet vacuum will clean just as well as the latest, greatest multi-mini-cyclone Dyson.
And our Kenmore/Panasonic filter bag canister vacuum "Better" does just as fine much cheaper than theses Bests gotcha' systems.
In a Good, Better, Best in all things world culture now . . . . always chose Better. Avoid extremes. Avoid purists.
J-I-C Steve Unruh