Understanding Energy Usage Reports

the energy usage report can be found on the harvest app under the data tab electricity used the electricity consumption is attributed to the heat pump(s) specifically, the sanco2 for hot water generation, and, if present, the heat pump a/c unit used for cooling and supplemental heating the heat pump a/c electricity use is an estimate; the air handler which distributes air throughout the home, or circulator pump for radiant, and the harvest pod, which controls the entire system and pumps water to and from the air handler or radiant heat exchanger harvest makes the operation of the heat pump independent from the delivery of heating and domestic hot water, prioritizing heat pump operation during off peak times thermal energy delivered the energy delivered as hot water, heating, and cooling the heat pump a/c energy delivered is an estimate sanco2 heat pump efficiency this represents the electrical energy consumed by the heat pump in relation to the thermal energy produced in the hot water the sanco2 efficiency ranges from approximately 200% to 550% factors influencing this efficiency include the outdoor air temperature, returning water temperature, frequency of startups and shutdowns, and defrosting harvest prioritizes operating the heat pump during suitable outdoor temperatures and regulates the return water temperature, allowing the sanco2 heat pump to operate more efficiently than standard heat pumps whole system efficiency this is the thermal energy delivered to the home as heating and hot water in relation to the electrical energy used by all components to generate and deliver heating and hot water thermal energy delivered refers to domestic hot water and heating/cooling provided to the home, excluding thermal losses from the water tank electrical energy includes the heat pump(s), the air handler fan, water pump, and electronic controller inside the pod including all components means system efficiency is lower than heat pump efficiency typical annual efficiency ranges from about 50% 60% for gas tank water heaters, 80% 95% for furnaces, 200% 300% for heat pumps q why is my system efficiency lower in summer than in winter, when the air is warmer? a thermal energy use is lower in summer when there is little or no heating as a result, thermal losses from the thermal battery make a larger share of overall energy consumption, leading to lower overall efficiency hourly energy usage average electricity used, and heat and hot water delivered, by hour of day, over the report time period harvest uses the tank as a thermal battery to run the heat pump at the lowest price and most efficient times of day, stores that energy as heat in the hot water tank, and delivers the stored energy as heating and hot water whenever it is needed the sanco2 heat pump occasionally runs at peak times when needed to avoid running out of hot water air handler fan and pod energy use also contribute to peak energy use but are much lower than heat pump energy use