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The pilot ran through the 2013-14 heating season. The Nest could lock out backup electric resistance heat, and the report says that it uses learning algorithms to minimize that backup heat. Energy Trust evaluation staff compared the homes' electricity use with 299 comparison homes from the same pool, and Apex Analytics reviewed the analysis. Apex reported on 10 October 2014 that weather-normalized savings were 781 kWh per year. That is 4.7% of total electricity use and 12% of heating load. The realization rate against the predicted 836 kWh was 93%. In a second survey, 89% of respondents rated the thermostat 4 or 5 out of 5. Only 11% of the homes offered a thermostat had one installed, and 11 thermostats were removed for technical problems. Apex called the savings preliminary. 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The pilot ran through the 2013-14 heating season. The Nest could lock out backup electric resistance heat, and the report says that it uses learning algorithms to minimize that backup heat. Energy Trust evaluation staff compared the homes' electricity use with 299 comparison homes from the same pool, and Apex Analytics reviewed the analysis. Apex reported on 10 October 2014 that weather-normalized savings were 781 kWh per year. That is 4.7% of total electricity use and 12% of heating load. The realization rate against the predicted 836 kWh was 93%. In a second survey, 89% of respondents rated the thermostat 4 or 5 out of 5. Only 11% of the homes offered a thermostat had one installed, and 11 thermostats were removed for technical problems. Apex called the savings preliminary. Energy Trust ran the pilot and commissioned the evaluation.","replication":{"produced_by":["Installers set the heat pump balance setting to Max Savings.","The thermostat locked out backup resistance heat without an outdoor temperature sensor."],"must_hold":["Occupants keep the Max Savings setting, since backup heat runs about twice as much without it.","Homes have Wi-Fi and a heat pump with backup resistance heat."],"echoes":[]}}},"provenance":{"kind":"legacy_record","basis":"Editorial assignment.","record_fields":["account","replication"],"source_refs":[]},"review_state":"record_mapped","coverage":"partial"}},"summary":{"total":91,"addressed":91,"known":29,"reviewed":2,"reviewed_complete":2,"reviewed_partial":0,"record_mapped":27,"review_not_assessed":62,"not_assessed":0,"complete":false,"by_state":{"value_present":29,"not_reported":0,"unresolved":62,"not_assessed":0,"not_applicable":0,"withheld":0,"source_unavailable":0}}},"presentation_version":"fe75bab9d3686a8692d265d91c335ad73cafad8586c4b425520ed31aabcc14ce"}