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...solar gains from solar energy penetrating the windows. In a really low-energy house design, free heat and solar gains may provide more useful heating than the heating system itself. Obviously in order to achieve a low overall space heating demand it is necessary to reduce the heat losses. Figure 4 shows a small house and illustrates the ways in which heat flows ......

...energy so lost is of little significance compared to the large amount of solar heat absorbed. The advantage to the gecko of warming up in the morning is uncertain, but it is possible that a physiological process such as digestion of the food eaten during the night requires a higher T b than the gecko can maintain at night. The ability of the gecko to vary skin colour...