Tempstar PTAC Thermostat Knob & Control Kit for THB09K50STA — 24V PTAC | Ships Today
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Overview
This is the OEM thermostat and knob assembly for the Tempstar THB09K50STA packaged terminal air conditioner (PTAC). It includes the 24V PTAC thermostat (OEM 1058517) and the matching control knob (OEM 1058437). The thermostat senses room temperature and cycles the compressor and heater contactor to maintain the setpoint. A failed or worn PTAC thermostat is one of the most common service calls on hotel, apartment, and assisted-living PTAC units — the room will stop holding temperature, short-cycle, or refuse to switch between heat and cool. Replacing it with the correct OEM part restores accurate, reliable temperature control without guesswork on calibration.
Specifications
| Spec | Value |
|---|---|
| Thermostat Part Number | 1058517 (TSTAT PTAC) |
| Knob Part Number | 1058437 (KNOB TSTAT PTAC) |
| Type | Mechanical PTAC Thermostat |
| Brand | Tempstar / Heil / ICP |
| Control Voltage | 24V |
| Fits Model | THB09K50STA |
Compatibility
Engineered as a direct OEM fit for the Tempstar/Heil/ICP THB09K50STA PTAC. The thermostat and knob are sold together so the assembly indexes and reads correctly after installation. Always confirm your unit's model and serial tag before ordering.
Installation Guide
- Safety First — Disconnect power at the PTAC plug or breaker and verify zero voltage with a multimeter.
- Access — Remove the front grille and control panel cover to reach the thermostat.
- Document — Photograph all wire positions and the knob orientation before disconnecting.
- Remove — Pull the knob, release the thermostat mounting clip/screws, and disconnect the 24V leads.
- Install — Mount the new thermostat, reconnect leads per your photo, and press on the new knob so the index aligns.
- Test — Restore power and verify the unit responds to setpoint changes in both heat and cool.
Signs You Need a Replacement
- Room temperature drifts well past the setpoint or never satisfies.
- Unit short-cycles or fails to start the compressor.
- Knob spins freely, is cracked, or no longer indexes to the dial.
- No switching between heating and cooling modes.
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