Tempstar PTAC Thermostat for THB12R34STA — Knob Control Kit | Ships Today
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Overview
This is the genuine OEM PTAC (Packaged Terminal Air Conditioner) thermostat assembly for the Tempstar THB12R34STA unit. The kit includes the thermostat control body (OEM part 1058517) and the matching control knob (OEM part 1058437). The thermostat senses room temperature and cycles the compressor and fan to maintain the setpoint you select on the knob. When a PTAC thermostat fails, the unit may run continuously, fail to cool or heat, short-cycle, or stop responding to the knob entirely. Replacing it with the exact OEM component restores reliable, accurate temperature control without guesswork on wiring or fit.
Specifications
| Spec | Value |
|---|---|
| Thermostat Part Number | 1058517 (TSTAT PTAC X) |
| Knob Part Number | 1058437 (KNOB TSTAT PTAC X) |
| Type | PTAC Knob-Control Thermostat |
| Brand | Tempstar (ICP / Heil) |
| Fits Model | THB12R34STA |
| Fitment | OEM Direct Replacement |
Compatibility
This thermostat and knob kit is a direct OEM fit for the Tempstar THB12R34STA PTAC. It is built and supplied under the ICP/Heil/Tempstar family and is the factory-specified control for this model. Always confirm your unit's model and serial tag matches before installing.
Installation Guide
- Safety First — Disconnect power to the PTAC at the wall plug or breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the front grille and control-panel cover to reach the thermostat assembly.
- Document — Photograph all wire positions and the knob orientation before disconnecting anything.
- Remove — Pull off the old control knob, disconnect the thermostat leads, and unfasten the thermostat body from the chassis.
- Install — Mount the new thermostat (1058517), reconnect the leads per your photo, and press the new knob (1058437) onto the shaft.
- Test — Restore power, set the knob through its range, and confirm the unit cycles correctly in both cool and heat modes.
Signs You Need a Replacement
- Unit runs constantly or never reaches the set temperature.
- No response when turning the control knob.
- Short-cycling — compressor turns on and off rapidly.
- Cracked, stripped, or missing control knob.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. National HVAC Parts fitment guarantee — backed by exact-fit OEM sourcing for your Tempstar PTAC.
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