wrote in message
...
Steve Shantz wrote:

If one shuts off the heat in April, what
will be the source of cooling for
this insulated mass so that it is 55 =B0F
come the 4th of July?

Trickle water over a north roof at night,
or through a pond, under some rocks
for safety and shading. Or keep the tub
hot to make DHW.

Or use a heat pump to extract heat from it for DHW. But that defeats the
object.

The Germans spiral a 6" plastic pipe around the outside of the foundations
and use this as the inlet to a heat recovery and vent system. Pre-heats in
winter and cools in winter. They don't need a/c in their climate.