Tempstar PTAC Thermostat for TEB12K25STA — 24V Control with Replacement Knob | Ships Today
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Overview
This is the genuine OEM PTAC (Packaged Terminal Air Conditioner) thermostat assembly for the Tempstar TEB12K25STA unit, supplied with the matching control knob (OEM 1058437) and the 24V thermostat body (OEM 1058517). The thermostat is the brain of the PTAC: it senses room temperature and switches the 24V control circuit to call for cooling, heating, or fan operation. When a PTAC thermostat fails, the unit may run continuously, fail to maintain setpoint, short-cycle, or stop responding to the dial entirely. A cracked or stripped knob is also a common service call, which is why the correct OEM knob is included to ensure smooth, accurate setpoint adjustment.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1058437 (Knob), 1058517 (Thermostat) |
| Type | PTAC Mechanical Thermostat |
| Brand | Tempstar / ICP / Heil |
| Control Voltage | 24V |
| Fits Model | TEB12K25STA |
| Includes | Thermostat body + replacement knob |
Compatibility
Designed as a direct-fit replacement for the Tempstar TEB12K25STA PTAC. These ICP/Tempstar/Heil packaged terminal units share a common parts platform across the TEB12K25 family, so always verify your unit's model and serial tag before ordering. This assembly is not a programmable wall thermostat; it is the integrated PTAC control.
Installation Guide
- Safety First — Disconnect power at the unit cord/disconnect and verify zero voltage with a multimeter.
- Access — Remove the PTAC front cover and control box panel.
- Document — Photograph all thermostat wire connections before disconnecting.
- Remove — Pull the old knob, release the thermostat mounting clips/screws, and disconnect the leads.
- Install — Mount the new thermostat, reconnect each lead per your photo, and press on the new knob.
- Test — Restore power and confirm the unit responds to setpoint changes in cool, heat, and fan modes.
Signs You Need a Replacement
- Unit runs nonstop or will not maintain the set temperature
- No response when turning the temperature dial
- Cracked, loose, or stripped control knob
- Short-cycling or erratic switching of the compressor/fan
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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