Carbon Action Project Launch Booklet | Page 21

• Ceiling fans The ceiling fans create airflow, one effect of which is to circulate the air that has been heated or cooled through contact with the slab. • Hot water system Water in the hot water system is heated using a heat pump. The heat pump operates during the day when the solar panels are gen- erating. • Water tanks They collect stormwater from the roof for uses such as flushing toi- lets and watering the garden, where potable water is not required. • Air conditioning There is no air conditioning. Our experience so far We moved into the new house in early December 2019. On the hottest days of December and January, the temperature inside the house reached a maximum of 26.5 degrees Celsius. The overnight tempera- tures in the house were low enough to sleep comfortably. The ceiling fans helped with the cooling effect of circulated air. Over this period, the hydronic cooling was turned on only when the solar panels were gener- ating, including on the hottest days. We do not think that we need air conditioning to remain comfortably cool during hot weather. Our elec- tricity bill for the period was negative. That is, the electricity retailer paid us for the excess electricity we fed into the grid. We are yet to experi- ence living in the house during the cooler seasons, but we expect it to be a vast improvement on our old house. - John and Lynda Dyer Carbon Action Project 18 1 March 2020