Honeywell Home YTHX9421R5085WW/U Prestige IAQ Thermostat with RedLINK and EIM

Deliver consistent comfort and smarter indoor air quality with the Honeywell Home Prestige IAQ thermostat — a professional-grade smart thermostat designed for residential and light commercial applications. This RedLINK-enabled thermostat pairs a high-definition 5.09 sq. in. color touchscreen with an Equipment Interface Module (EIM) to keep wiring minimal (2-wire at the thermostat) while controlling complex systems: up to 4 stages of heat and 2 stages of cool on heat pump systems, or 3 heat/2 cool on conventional setups. Built-in diagnostics, Delta T alerts and detailed performance logs provide proactive system monitoring and troubleshooting to reduce service calls and improve operational uptime. RedLINK compatibility opens remote monitoring and control via the Internet Gateway and wireless sensors so facilities managers and HVAC contractors can view system status, IAQ data and energy trends off-site. Energy Star rated and Title 24 compliant for light-commercial use, the Prestige IAQ supports humidification, dehumidification and ventilation control plus USB-based installer setup and branding. For contractors specifying reliable HVAC monitoring, energy management and IAQ control, the Honeywell Home Prestige IAQ thermostat is a robust choice — contact your distributor or add to your project spec.

• Simplify installs and reduce wiring costs: 2-wire thermostat with Equipment Interface Module (EIM) lets HVAC and IAQ equipment be centrally connected while keeping the thermostat wiring minimal.
• Remote monitoring and control with RedLINK: Supports RedLINK Internet Gateway, Portable Comfort Control and wireless sensors for off-site system access, alerts and energy management.
• Faster service and less downtime: Built-in Delta T alerts, performance logs and searchable alerts/history speed diagnostics and drive repeat commercial/residential service revenue.
• Flexible multi-stage HVAC and IAQ control: Manages up to 4 stages of heat/2 stages of cool (heat pump) or 3 heat/2 cool (conventional) plus 3 IAQ outputs for humidification, dehumidification and ventilation.
• Installer-friendly features for scalability: 7-day Smart Schedule, large 5.09 sq. in. color touchscreen, USB port for installer setup and logo, and Title 24 / light-commercial capabilities.