What are the specs for this Thermostat?

The correct replacement for Tempstar model THB09K25STA — 24V Control | 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 THB09K25STA — 24V Control | 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 PTAC Thermostat for THB09K25STA — 24V Control | Ships Today

Name: Tempstar PTAC Thermostat for THB09K25STA — 24V Control | Ships Today
Brand: Tempstar
SKU: 1058437-GEN
Price: 42.00 USD
Availability: InStock

SKU: 1058437-GEN Brand: Tempstar

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Overview

This OEM PTAC thermostat assembly is the temperature control for the Tempstar THB09K25STA packaged terminal air conditioner (PTAC) heat pump. It includes the 24V thermostat body (OEM 1058517) and the matching control knob (OEM 1058437). The thermostat senses room temperature and signals the unit's compressor, fan, and reversing valve to maintain the setpoint. A failed PTAC thermostat is one of the most common causes of a unit that will not turn on, runs constantly, or ignores temperature changes. Because it is a low-voltage 24V control, replacement is straightforward and restores accurate, reliable comfort control.

Specifications

Spec	Value
OEM Part Numbers	1058517 (TSTAT PTAC), 1058437 (KNOB TSTAT PTAC)
Type	PTAC Thermostat with Knob
Brand	Tempstar
Control Voltage	24V
Application	PTAC Heat Pump / Air Handler
Fits Model	THB09K25STA

Compatibility

Engineered as a direct OEM replacement for the Tempstar THB09K25STA PTAC unit. The same thermostat and knob assembly is shared across the Heil/ICP THB09K25 PTAC family. Always verify your existing OEM part number (1058517 / 1058437) 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 wiring before disconnecting.
Remove — Pull the old knob, then disconnect the thermostat leads and unclip the thermostat body.
Install — Mount the new thermostat, reconnect leads per your photo, and press on the new knob.
Test — Restore power and confirm the unit responds correctly to setpoint changes.

Signs You Need a Replacement

Unit will not turn on or off regardless of knob position.
Room temperature never matches the setpoint.
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 PTAC Thermostat for THB...

$42.00

Frequently Asked Questions

Does this Thermostat fit my Tempstar THB09K25STA — 24V Control | Ships Today?

Yes. This is the factory-specified OEM thermostat for the Tempstar THB09K25STA — 24V Control | 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 THB09K25STA — 24V Control | 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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