Tempstar PTAC Thermostat Kit for THB12R50STA — Thermostat + Knob | Ships Today

Overview

This OEM Tempstar PTAC thermostat kit pairs the replacement thermostat (part number 1058517) with its matching control knob (part number 1058437) for your THB12R50STA packaged terminal air conditioner. The thermostat senses room temperature and cycles the unit's heating and cooling stages to hold your setpoint, while the knob gives the user a positive, calibrated way to dial in comfort. PTAC thermostats take constant handling and wear, so a worn or cracked knob, a unit that cycles erratically, or a system that no longer responds to temperature changes usually points to a failed thermostat. Replacing both pieces together restores accurate, reliable control.

Specifications

Compatibility

Direct-fit thermostat and knob for the Tempstar THB12R50STA PTAC unit and related ICP/Heil PTAC chassis using the same control. Verify the thermostat body style and knob shaft match your existing control before installing.

Installation Guide

1. Safety First — Unplug or disconnect power to the PTAC and verify zero voltage with a multimeter.
2. Access — Remove the front cover/control panel to expose the thermostat.
3. Document — Photograph all thermostat wire terminals and the knob orientation before disconnecting.
4. Remove — Pull the old knob, disconnect the thermostat leads, and unscrew the thermostat from the control panel.
5. Install — Mount the new thermostat, reconnect each wire per your photo, and press on the new knob.
6. Test — Restore power and confirm the unit cycles heating and cooling correctly across the knob range.

Signs You Need a Replacement

• Unit won't respond to temperature setting changes
• Erratic short-cycling or failure to reach setpoint
• Cracked, stripped, or loose control knob
• Thermostat contacts stuck, pitted, or burnt

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.