Resideo Technologies T9 Smart Thermostat

(Evaluated by UC Berkeley) An advanced thermostat controls residential and small commercial Heating, Ventilation, and Air Conditioning (HVAC) equipment while communicating with other systems, and uses computational capability to provide advanced functionality, such as including additional sensors, the ability to group multiple thermostats, energy reports, and/or notifications.

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Technology Basics Application Guidance Energy & Cost Impacts

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Resideo Technologies T9 Smart Thermostat

The Honeywell Home advanced thermostat boasts flexible scheduling: no schedule, time-based schedule, the ability to control based on occupancy (through location geo-fencing, or with additional sensors and an active-priority occupancy algorithm). The thermostat uses WiFi and has a mobile app.

Hub Highlights:

Remote sensors (including occupancy) and outdoor temperature through Internet weather

Last Edited on: 05/26/2023

Model Number	RCHT9 10WF
Primary Setting	Commercial
User Interface Options	Mobile app (Resideo)
Multiple Thermostat Control	N/A
Access Restriction	Can enable partial or full screen ""lock mode"" Temperature range stops: minimum/maximum heat/cool setpoints
Notifications/Reports	Alert if temperatures rises above/below threshold, filter replacement reminder
Available Sensors	Separate temperature/relative humidity/occupancy sensors; outdoor temperature through Internet weather
Demand Response Capable	Can participate in Utility Demand Response programs; Open Automated Demand Response (OpenADR) capable

Last Edited on: 07/2023

Model	RCHT9 10WF
Sample Size	1
Thermal sensor accuracy (@68F)	−0.1±0.3 °F
Thermal sensor accuracy (@75F)	−0.4±0.1 °F
Impact of surrounding surface temperature on Thermal sensor accuracy	Good
Standby power	0.59 W

Last Edited on: 10/03/24

Data Collection

The technology evaluation team performed a heuristic evaluation of basic thermostat modes of operation (turning on, changing setpoint, reading display) for each of the tested products. In heuristic evaluations assess user interfaces according to guidelines for the design of user-friendly systems.

Estimated Usability

Good: likely good usability in most tasks; Fair: likely fair usability in most tasks.

Fair