Heating and Cooling Systems
Verde is heated and cooled using geothermal energy. Essentially we
borrow underground water, put it through a heat exchanger, then return
it below ground.
water has a near constant temperature all year round, in our case around
18.5 degrees Celsius or 65 degrees Fahrenheit. In the winter
that's not far short of the comfort temperature of 21 or 22 degrees C that we are trying to achieve around the house and it has huge cooling
potential through the hot Greek summer.
electric pump at the bottom of a borehole around 18.5 metres (60 feet)
deep, sends water on demand to a heat exchanger.
In the winter, a heat pump sends chilled water through the other
side of the heat exchanger and extracts heat from the outside water.
The outside water is returned underground via a second borehole.
highly efficient heat pump uses a relatively
small amount of electricity to bring
the water temperature up to around 38 degrees
That water circulates through an underfloor heating system in
those parts of the house in which we live.
Our guest rooms are less often occupied through the winter and
they are heated using fan coil units, essentially air blowers whose
primary source of energy is hot water sent by the heating system.
the summer, the relatively cold outside water extracts heat through the
heat exchanger. Water for
the underfloor system is cooled to around 19
The floor cannot be cooled any further without the risk of
condensation so fan coil units provide additional cooling.
in all, relatively small amounts of electricity are used for heating, cooling, and
pumping water but the majority of our energy needs are met by
geothermal means, truly a renewable energy source.
for personal use is heated primarily with around 7 square metres (75
square feet) of solar panels on our roof.
If there is no sun, the heating system can feed geothermal energy
to the water heater as well.
the summer, solar power alone provides almost unlimited hot water all