What are the specs for this Thermostat?

The correct replacement for Tempstar model THB09K25DCA — 24V | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number THB09K25DCA — 24V | Ships Today.

What symptoms indicate I need a new thermostat?

Common symptoms that indicate you need a new thermostat include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this thermostat compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar Low Temp PTAC Thermostat for THB09K25DCA — 24V | Ships Today

Name: Tempstar Low Temp PTAC Thermostat for THB09K25DCA — 24V | Ships Today
Brand: Tempstar
SKU: 1058437-GEN
Price: 48.00 USD
Availability: InStock

SKU: 1058437-GEN Brand: Tempstar

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Overview

This OEM thermostat package is the complete 24V temperature control for the Tempstar THB09K25DCA PTAC heat pump. It includes the PTAC thermostat body (OEM 1058517), the low-temperature cutout thermostat (OEM 1059022), and the control knob (OEM 1058437). The main thermostat maintains the room setpoint while the low-temp thermostat protects the unit by interrupting operation when coil or ambient temperatures fall too low — preventing coil freeze-ups and compressor damage. A failure in either control can leave the unit unresponsive, freezing the coil, or running without temperature regulation. This set restores full, protected comfort control.

Specifications

Spec	Value
OEM Part Numbers	1058517 (TSTAT PTAC), 1059022 (TSTAT LOW TEMP), 1058437 (KNOB TSTAT PTAC)
Type	PTAC Thermostat + Low-Temp Cutout with Knob
Brand	Tempstar
Control Voltage	24V
Application	PTAC Heat Pump / Air Handler
Fits Model	THB09K25DCA

Compatibility

Direct OEM replacement for the Tempstar THB09K25DCA PTAC heat pump. The thermostat, low-temp cutout, and knob are shared across the Heil/ICP THB09K25 PTAC family. Confirm your existing OEM part numbers before ordering.

Installation Guide

Safety First — Disconnect power at the unit and breaker; verify zero voltage with a multimeter.
Access — Remove the front grille and service panel to reach the control area.
Document — Photo all thermostat and low-temp cutout wiring before disconnecting.
Remove — Pull the old knob, disconnect the thermostat and low-temp leads, and unclip both controls.
Install — Mount the new thermostat and low-temp cutout, reconnect per your photo, and press on the knob.
Test — Restore power and confirm proper setpoint response and low-temp protection.

Signs You Need a Replacement

Coil ices over during low-temperature operation.
Unit will not respond to the temperature knob.
Compressor short-cycles or runs continuously.
Cracked, loose, or missing 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

Tempstar Low Temp PTAC Thermosta...

$48.00

Frequently Asked Questions

Does this Thermostat fit my Tempstar THB09K25DCA — 24V | Ships Today?

Yes. This is the factory-specified OEM thermostat for the Tempstar THB09K25DCA — 24V | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the thermostat on my Tempstar THB09K25DCA — 24V | Ships Today?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new thermostat?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this thermostat compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar thermostat?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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