Hey Sally, This is from the ‘Thermal Mass in Summer’ section from our website, "With correct eave overhang on the North of your building & thermal mass being shielded from direct solar gain we can control the increase in the ambient air temperature of the building. During the day heat gains from external temperature, the occupants of the building, and any electrical lighting and equipment, is absorbed by the exposed thermal mass of the building and releases stored cool within the thermal mass, thus limiting the temperature rise within the space to be within acceptable levels for human thermal comfort. By the end of the day the thermal mass of the building has in turn warmed up, and now as external temperatures reduce the heat can be released and the thermal mass cooled down ready for the start of the next day. However this "regeneration" process is only effective if the building is ventilated at night when the external air temperature has dropped below the internal temperature, to carry away the heat that has been absorbed during the day. This can be achieved through naturally ventilating buildings (opening windows etc.) or the use of automated ventilation systems. This reduces or totally eliminates the need for artificial cooling systems to be installed, thus reducing the overall energy consumption of the building to attain a comfortable living environment." When temperatures do not drop at night for 3-4 nights, our houses are still far more comfortable than outside, warmer than it would be if night ventilation could be achieved, but still a comfortable temperature. In our house we just use ceiling fans during those in-between days! We find that even when it is warmer in our houses in prolonged hot periods than it would be with air-conditioning, the quality of the air and feel of being inside the house is much nicer than what it would be with the everyday use of an air-conditioner – not to mention benefit that not using air-conditioning has on the environment. Hope this answers your question :)

Bump.

love the idea of rammed earth but would use it like reverse brick veneer clad with insulated steel siding

I admire the older homes for their graceful beauty, but to live in one is a real pain. Often the windows are tiny and don't let enough light in, the ceilings are usually 13 foot tall makes heating difficult. My friend had one very similar and much and all as I stayed there many a time and enjoyed my time, I think I would prefer a later design.