Tempstar PTAC Low-Temp Thermostat Kit for THB09K50DCA — 24V PTAC | Ships Today

Overview

This OEM thermostat kit fits the Tempstar THB09K50DCA packaged terminal air conditioner (PTAC). It includes the 24V PTAC thermostat (OEM 1058517), the low-temperature thermostat (OEM 1059022), and the matching control knob (OEM 1058437). The PTAC thermostat cycles the compressor and heater to hold the room setpoint, while the low-temp thermostat protects the unit and occupants by managing operation in cold-ambient conditions. A failed thermostat is a frequent PTAC service issue — rooms stop holding temperature, short-cycle, or won't switch modes. The correct OEM parts restore accurate, protected temperature control.

Specifications

Compatibility

Direct OEM fit for the Tempstar/Heil/ICP THB09K50DCA PTAC. The thermostat, low-temp control, and knob ship together so the assembly reads and indexes correctly after install. Verify your model and serial tag before ordering.

Installation Guide

1. Safety First — Disconnect power at the PTAC plug or breaker and verify zero voltage with a multimeter.
2. Access — Remove the front grille and control panel cover.
3. Document — Photograph all wiring, sensor routing, and knob orientation before disconnecting.
4. Remove — Pull the knob, release the thermostat and low-temp control mounts, and disconnect the 24V leads.
5. Install — Mount the new thermostat and low-temp control, reconnect per your photo, and press on the new knob aligned to the index.
6. Test — Restore power and confirm the unit responds in both heat and cool and that low-temp protection functions.

Signs You Need a Replacement

• Room overshoots or never satisfies the setpoint.
• Compressor short-cycles or fails to start.
• Unit malfunctions in cold-ambient (low-temp) conditions.
• Knob is cracked, spins freely, or won't index.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.