Tempstar PTAC Thermostat Kit for THB07K25DCA — Low-Temp Control & Knob | Ships Today

Overview

This OEM PTAC thermostat kit for the Tempstar THB07K25DCA includes the main PTAC thermostat (1058517), the low-temperature thermostat (1059022, TSTAT LOW TEMP), and the control knob (1058437). The PTAC thermostat manages room comfort while the low-temp thermostat acts as a freeze/lock-out protection control, preventing operation when temperatures drop below the safe range. Failure of either control leads to the unit not reaching setpoint, running continuously, locking out in cold weather, or failing to respond to the knob. These are factory-spec parts matched to the unit's 24V control circuit.

Specifications

Compatibility

Engineered for the Tempstar / Heil / ICP THB07K25DCA PTAC and related THB07K25 series units that share the same thermostat and low-temp control platform. Verify OEM part numbers 1058517, 1059022, and 1058437 against your failed parts before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the PTAC grille and control-area service panel.
3. Document — Photograph all thermostat and low-temp control wiring before disconnecting.
4. Remove — Pull the old knob, release both thermostats from their brackets, and disconnect the 24V leads.
5. Install — Mount the new thermostats, reconnect leads per your photo, and press on the new knob.
6. Test — Restore power, call for cooling and heating, and confirm normal operation and low-temp protection.

Signs You Need a Replacement

• Unit runs constantly or never reaches the setpoint.
• Unit locks out or won't run in cold conditions (failed low-temp control).
• Knob is cracked, slipping, or won't adjust temperature.
• Short-cycling or erratic compressor and heater operation.

Shipping & Returns

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