Tempstar PTAC Thermostat for THB09R50SPA — Manual Control with Knob | Ships Today
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Overview
This is the genuine OEM manual PTAC thermostat assembly for the Tempstar THB09R50SPA packaged terminal unit. The kit pairs the thermostat body (OEM 1058517, TSTAT PTAC X) with its matching control knob (OEM 1058437, KNOB TSTAT PTAC X). As the control heart of the PTAC, this thermostat reads room temperature and switches the compressor, fan, and heat to hold your setpoint. A failed thermostat shows up as constant running, a unit that won't start, short-cycling, or a dial that no longer changes anything. Installing the correct OEM thermostat restores precise, dependable temperature control.
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
A direct-fit replacement for the Tempstar THB09R50SPA PTAC chassis. The 1058517 thermostat and 1058437 knob are shared across matching ICP, Heil, and Comfortmaker PTAC units of this series. Confirm your old part numbers before ordering.
Installation Guide
- Safety First — Disconnect power and verify zero voltage with a multimeter.
- Access — Remove the front grille and control-area service panel.
- Document — Photograph every thermostat wire connection before disconnecting.
- Remove — Pull the knob, release the mounting clip, and disconnect the sensing bulb and wiring.
- Install — Mount the new thermostat, clip the sensing bulb in its original location, reconnect per your photo, and press on the new knob.
- Test — Restore power and verify response across cooling and heating modes.
Signs You Need a Replacement
- Compressor runs continuously or never engages
- Knob has no effect on temperature
- Erratic short-cycling
- Damaged or loose 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