New earth sheltered PAHS construction
I would like all opinions regarding my new home construction project. I have a full 3 days experience learning Sketchup and have managed to put several ideas on paper. Please review my plans…and pick holes in them :). I don’t guarantee to change my mind, but I do promise to research varying opinions thoroughly and supporting data would be appreciated.
Mixed humid climate Missouri 39 deg latititude
CoMo HDD 5173
Sunny days 195
Humidity ave 70% 83% AM, 56% PM
111 days rain for 46″/yr
10 days snow for 14″/yr
Shell: 28’x28′ Terra-dome module x 3 living + 1 garage
Southern unimpeded exposure, gentle slope estimated 5%, Soils Keswick and Leonard silt loam, minimal rocks, but I ran into a thin line of shale when drilling homes for fence posts a few years ago. Goal-one or less ceiling fenestrations per dome module.
HVAC: Passive solar for primary heat source, 19 3×5 windows (12 fixed, 7 casement, u<.3, SHGC>.5) 1.5 feet under 3 foot overhang for summer shading. Mini-split (one or two?) for back up heat/cooling. Anticipate needing external heatsource for approx 2 years while PAHS envelop heats up.
Dehumidification: needs lots of help here: Again 2 years standalone dehumidifier while concrete shell dries more thoroughly, minimal external exposure to outside moisture due to PAHS umbrella. Goal to manage open windows/passive ventilation to lower humidity seasons/times of day.
EAHX (earthtubes) with spot exhaust mandatory at stove/bathrooms, need additional passive stack ventilation or can an unused power exhaust be ‘leaky enough’ to stack ventilate?
Super low energy use electrical appliances with goal to solar addition after 1-2 years of data collection. DC wiring above waist high, capturing DC ambient lights, task lights, circulating fan, maybe $3000 DC fridge, with AC wiring below waist for plug in appliances. DC floor lamps are hard to find!
Air heat pump waterheater because SO already has one, and the cool air release can help freezer and fridge be more efficient, swapping heat with the WH.
So please chime in on my project. I have an interested builder, land, $ and a quiet winter to get all the details addressed.