Venstar VST1035 Thermostat

The Venstar VST1035 Thermostat is a professional-grade, direct replacement for P474-1035, engineered for reliable control of single-stage heating and cooling systems. This "Value Series" digital thermostat is built for compatibility with a broad range of equipment, including gas/electric, heat pump, and hydronic systems. It features a versatile 5+2 day programmable schedule (separate weekday/weekend routines) to optimize energy efficiency without sacrificing comfort. For contractors and service technicians, the VST1035 offers a dual-power design that can be battery powered or system powered via a 24V common wire, making it an ideal choice for 2, 3, or 4-wire installations where a C-wire may not be present.

Equipped with a large, high-contrast digital display, the VST1035 prioritizes ease of use and quick troubleshooting. The unit includes a bi-color LED indicator to verify system demand at a glance and adjustable filter change reminders (0-1950 hours) to support preventative maintenance. Standard features like RC and RH terminals allow for dual-transformer applications, ensuring seamless integration into complex HVACR environments. Its sleek, horizontal mounting and white finish provide a clean aesthetic for both residential and light commercial jobsites.

• Broad Compatibility: Seamlessly operates with 1H/1C HVAC systems, including gas, electric, millivolt, and heat pumps without auxiliary heat.
• Dual Power Versatility: Can be hardwired for constant 24VAC power or run on 2 AA alkaline batteries for older 2-wire or 4-wire thermostat retrofits.
• Precision Scheduling: Features 5+2 day programming to help users manage setpoints and lower utility costs during unoccupied hours.
• Service-Friendly Features: Includes a bi-color status LED (Red for Heat, Green for Cool) and adjustable service notifications for air filters.
• Simple Retrofit: Designed as the logical upgrade path for the Totaline P474-1035 with matching footprint and terminal nomenclature.

Does this thermostat require a common wire (C-wire)?
No, the Venstar VST1035 is designed to operate on 2 AA batteries if a common wire is not available, though it can be hardwired to the system’s 24V power for continuous operation.

Is the VST1035 compatible with multi-stage heat pumps?
The VST1035 is specifically designed for single-stage (1 Heat / 1 Cool) applications. It is not compatible with systems requiring a second stage of auxiliary or emergency heat.

Can I use this for millivolt floor heaters or wall furnaces?
Yes, this unit is compatible with millivolt heating systems, making it a versatile stock item for older residential heating units.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.