Tempstar Thermostat for TEB12R25SPA — PTAC Control with Knob | Ships Today
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
Overview
This is the OEM PTAC thermostat assembly for the Tempstar TEB12R25SPA packaged terminal unit, including the thermostat control body (part 1058517) and its matching adjustment knob (part 1058437). The thermostat is the temperature-sensing brain of the unit — it reads room temperature, compares it to the dial setpoint, and switches the 24V control circuit to call for cooling, heating, or fan operation. When this component degrades, the unit either loses temperature control entirely or cycles erratically. A worn or cracked knob also makes accurate setpoint selection impossible, which is why the matched knob is included. This is a genuine OEM replacement built to the exact 24V control specification of the original.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1058517 (thermostat), 1058437 (knob) |
| Type | PTAC Mechanical Thermostat |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24V |
| Fitment | OEM Direct Replacement |
| Includes | Thermostat body + adjustment knob |
Compatibility
Designed as a direct fit for the Tempstar TEB12R25SPA PTAC system. The TEB12 platform is shared across ICP, Tempstar, Heil, and Comfortmaker branded packaged terminal units — confirm your part number against the unit before ordering if your model differs.
Installation Guide
- Safety First — Disconnect power at the unit disconnect and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the front grille and service panel to expose the control box.
- Document — Photograph all thermostat wires and terminal positions before disconnecting anything.
- Remove — Pull the old knob, then release the thermostat from its bracket and disconnect the 24V control leads.
- Install — Mount the new thermostat, reconnect the control leads per your photo, and press on the new knob.
- Test — Restore power and confirm the unit responds to setpoint changes in both heat and cool modes.
Signs You Need a Replacement
- Unit will not maintain the selected temperature or runs continuously.
- No response when the dial is turned to call for heating or cooling.
- Cracked, loose, or missing control knob.
- Erratic short-cycling unrelated to refrigerant or airflow faults.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days