The attached greenhouse for year around food production shares the solar heating system of the entire house (drain- back system) and is designed so that the temperature in the greenhouse never falls below 40F in the winter time. Plants can be watered with water collected from the roof.

The entire building shell is designed as a Passive House, super insulation, thermal bridge free detailing, triple glazed windows w/ insulated frames guarantee minimal heat loss.

A whole house ventilation system with up to 95% heat recovery provides fresh, filtered and pollen free air 24/7.
The inhabitants enjoy an unsurpassed level of comfort.
Dan reports that last winter the backup wood stove was never used and the indoor temperature dropped down to 60 F only one time for a few minutes. This is with no backup whatsoever!