Why Not Zero ?
A house we live in can emit zero carbon dioxide. This is the main page for zero emission house projects
Photovoltaics
Not the least expensive option, but a solid investement in the current climate of price uncertainty. One
can not vouch for the inverters, but the panels are made of stone, and all materials are chosen to degrade
as little as possible. The warranted life of 25 years will likely be 40.
Solar Thermal
In different guises solar thermal is used around the world, in warmed sunnier countries to maintina the hot
water boiler. It is an underexploited source of energy, especially when one considers small steamturbines
that can convert heat into electricity, and heat storage.
Wind
Windpower is still relative expensive.
Heat Pumps
Heat pumps compress waste or stored heat and so use lees energy than they put out in warm water or air. Today's
heatpumps are still expensive, the industry needs to be told they are glorified fridges and adapt the price accordingly. Also they
are often promoted with 10 degrees ground heat, that is drilled up. A smarte arrangement is to use stored solar heat at a depth of
1,6 meter or so. The more heat you start with the less energy they use. Worst case implementation they are simply electric heaters, which
is 3 times as carbon intensive as gas heaters.
Heat Storage
A mass can store heat. One can store solar heat underground, even at depths of 1,6 meter, without
complicated technology, or drill deeper and even use ground water. The latter spreads with the stored
heat. In some cases a special purpose concrete tank is build (like a water reservoir). Research is going on
into chemical storage.
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