29 May 2012: Ground temperatures stayed low during the very cold spring of 2012, but have risen dramatically in the final little heat wave of May 2012. The temperature is up to 13.5ºC, as warm as it ever gets in summer, usually, and may get warmer with the addition of Tubes and the cleaning of water out of the Manifold.
|Ground Temps. Sunbox was installed Mar 2012, |
and the area circled is the cold spring of 2012
|Running energy costs, annually. |
The upturn was caused by cold spring, but the figures have levelled off.