Tempstar PTAC Thermostat for THB09R50STA — Manual Control with Knob | Ships Today
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Overview
This is the genuine OEM manual PTAC thermostat assembly for the Tempstar THB09R50STA packaged terminal unit. The kit includes the thermostat body (OEM 1058517, TSTAT PTAC X) and its matching control knob (OEM 1058437, KNOB TSTAT PTAC X). The thermostat is the brain of the PTAC — it senses room temperature and cycles the compressor, fan, and heating elements to maintain the setpoint. When a PTAC thermostat fails you typically see a unit that runs constantly, never starts, short-cycles, or ignores the temperature dial entirely. Replacing the thermostat with the correct OEM part restores accurate, reliable comfort control without guesswork.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1058517 (thermostat), 1058437 (knob) |
| Type | PTAC Manual Thermostat |
| Brand | Tempstar / Heil / ICP |
| Control Voltage | 24V |
| Application | Packaged Terminal Air Conditioner |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as a direct-fit replacement for the Tempstar THB09R50STA PTAC chassis. The same component family is shared across ICP, Heil, and Comfortmaker-branded PTAC units of this generation. Always verify your existing part number against 1058517 / 1058437 before ordering.
Installation Guide
- Safety First — Disconnect power at the unit's disconnect or breaker and verify zero voltage with a multimeter.
- Access — Remove the front grille and control-area service panel.
- Document — Photograph all wire connections to the thermostat before disconnecting.
- Remove — Pull the control knob, release the thermostat mounting clip, and disconnect the capillary/sensing bulb and wiring.
- Install — Mount the new thermostat, route the sensing bulb to its original clip, reconnect wiring per your photo, and press on the new knob.
- Test — Restore power and confirm the unit responds to the knob across cooling and heating settings.
Signs You Need a Replacement
- Unit runs nonstop or never cycles off
- No response when turning the temperature knob
- Short-cycling or erratic compressor operation
- Cracked, loose, or spinning control knob
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