Tempstar PTAC Thermostat Kit for THB09R25SPA — 24V Control with Knob | Ships Today

Overview

This OEM PTAC thermostat assembly is the temperature control for the Tempstar THB09R25SPA packaged terminal unit. It includes the 24V PTAC thermostat (OEM 1058517) and the matching control knob (OEM 1058437). The thermostat reads room temperature and tells the unit when to heat or cool; the knob lets the occupant set and hold a comfortable temperature. A worn or failed thermostat shows up as constant running, short-cycling, or a unit that simply ignores the dial. Installing the factory-correct thermostat restores precise control and dependable operation.

Specifications

Compatibility

Direct-fit replacement for the Tempstar THB09R25SPA PTAC. This thermostat and knob are shared across many Heil, ICP, and Comfortmaker PTAC models in the THB09 family. Verify your current part number before ordering to ensure an exact match.

Installation Guide

1. Safety First — Disconnect power at the unit and breaker, verify zero voltage with a multimeter.
2. Access — Remove the front grille and control panel cover to reach the thermostat.
3. Document — Photograph the wiring to the thermostat before disconnecting anything.
4. Remove — Pull the knob, release the thermostat from the bracket, and disconnect the 24V leads.
5. Install — Mount the new thermostat, reconnect per your photo, and seat the new knob.
6. Test — Restore power and confirm the unit responds to setpoint changes in heat and cool.

Signs You Need a Replacement

• Room never reaches the set temperature or unit runs nonstop.
• Knob no longer adjusts the setpoint.
• Frequent short-cycling or erratic operation.
• Unit unresponsive to temperature changes.

Shipping & Returns

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