Space Heating and Cooling Energy Savings of Smart Thermostats in a Hot-Humid Climate

Winter 2016
This online-only article is a supplement to the Winter 2016 print edition of Home Energy Magazine.
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December 13, 2016
Smart thermostats (sometime called “connected thermostats”) regulate the home temperature by self-programming, using heuristic evaluation of user habits and occupancy. The Phased Deep Retrofit (PDR) project, conducted by the Florida Solar Energy Center from 2012 – 2015, was designed to evaluate shallow and deeper retrofit in a large sample of intensively metered homes. In the second phase of this project, 25 Nest thermostats and 2 Lyric thermostats were installed in participating homes. A full year of sub-metered hourly temperature and heating-and-cooling system energy data was available prior to the installation of Nest thermostats, allowing detailed evaluation of interior temperature-related changes as well as energy related savings. Overall measured heating-and-cooling energy savings averaged 9.5% or about 500 kWh a year.

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