Programmable Thermostat, 1H/1C Heat Pump, 1H/1C Conventional, T4 Pro

Honeywell T4 Pro Programmable Thermostat – TH4110U2005/U: 1H/1C Control for Conventional and Heat Pump Systems

The Honeywell T4 Pro Thermostat (TH4110U2005/U) provides a streamlined solution for managing single-stage heating and cooling systems. Designed for compatibility with 1 heat/1 cool conventional systems or heat pumps without auxiliary heat, it supports configurable scheduling modes and offers precise temperature regulation for improved efficiency.

Product Highlights for Professional Use

Built for ease of use and installation, the T4 Pro includes the Universal Wall Plate (UWP) mounting system for consistent jobsite installation. The large LED-backlit display provides clear visibility during setup and adjustment, while the soft-key navigation supports straightforward programming. With 7-day, 5-1-1, and 5-2 scheduling options, it offers flexibility for various residential applications.

Core Features

• Control Capability: 1H/1C for conventional or single-stage heat pump systems
• Temperature Range: 40°F to 90°F (heat), 50°F to 99°F (cool)
• Programming Modes: Selectable 7-day, 5-1-1, 5-2, or non-programmable
• Changeover: Auto or manual mode supported
• Mounting: Universal Wall Plate with terminal block and hardware
• User Interface: 3.93 sq-in LED backlit display

Technical Specifications

• Power Source: 20–30 VAC hardwired or battery backup (2 AA batteries)
• Dimensions: 4-1/16" H × 4-1/16" W × 1-3/32" D
• Operating Temperature: 37°F to 102°F ambient
• Humidity Tolerance: 5% to 90% RH, non-condensing
• Terminal Designations: R, Rc, C, W, Y, G, O/B, U, L/A, E, Aux, S1, S2
• Warranty: 5-Year Limited

Installation Notes

Designed to reduce labor time, the T4 Pro is suited for new installs or system replacements where single-stage compatibility is required. Setup can be completed through the display interface without additional tools or software. For code compliance and safety, installation should be performed by a licensed HVAC technician.

Application-Specific Value

The Honeywell T4 Pro is appropriate for residential systems that do not require multi-stage control or auxiliary heat. Its compact footprint and standardized interface make it a practical choice for retrofits, service replacements, and volume installations in residential environments.

Included Components

• Thermostat with integrated backplate
• UWP mounting system with screws
• Quick-install guide and wiring labels