What are the specs for this Thermostat?

The correct replacement for Tempstar model THB12R25STA — Knob Control Kit | 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 THB12R25STA — Knob Control Kit | 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 THB12R25STA — Knob Control Kit | Ships Today

Name: Tempstar PTAC Thermostat for THB12R25STA — Knob Control Kit | Ships Today
Brand: Tempstar
SKU: 1058437-GEN
Price: 54.95 USD
Availability: InStock

SKU: 1058437-GEN Brand: Tempstar

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Overview

This is the genuine OEM PTAC (Packaged Terminal Air Conditioner) thermostat assembly for the Tempstar THB12R25STA unit. The kit includes the thermostat control body (OEM part 1058517) and the matching control knob (OEM part 1058437). The thermostat reads room temperature and cycles the compressor and fan to hold the setpoint selected on the knob. A failed PTAC thermostat typically causes continuous running, no cooling or heating, short-cycling, or a knob that no longer changes the temperature. Installing the exact OEM part restores precise control and avoids any wiring or fit uncertainty.

Specifications

Spec	Value
Thermostat Part Number	1058517 (TSTAT PTAC X)
Knob Part Number	1058437 (KNOB TSTAT PTAC X)
Type	PTAC Knob-Control Thermostat
Brand	Tempstar (ICP / Heil)
Fits Model	THB12R25STA
Fitment	OEM Direct Replacement

Compatibility

This thermostat and knob kit is a direct OEM fit for the Tempstar THB12R25STA PTAC. It is supplied under the ICP/Heil/Tempstar family and is the factory-specified control for this model. Confirm your unit's model and serial tag before installing.

Installation Guide

Safety First — Disconnect power to the PTAC at the wall plug or breaker and verify zero voltage with a multimeter before touching any wiring.
Access — Remove the front grille and control-panel cover to reach the thermostat assembly.
Document — Photograph all wire positions and the knob orientation before disconnecting anything.
Remove — Pull off the old control knob, disconnect the thermostat leads, and unfasten the thermostat body from the chassis.
Install — Mount the new thermostat (1058517), reconnect the leads per your photo, and press the new knob (1058437) onto the shaft.
Test — Restore power, set the knob through its range, and confirm the unit cycles correctly in both cool and heat modes.

Signs You Need a Replacement

Unit runs constantly or never reaches the set temperature.
No response when turning the control knob.
Short-cycling — compressor turns on and off rapidly.
Cracked, stripped, or missing control knob.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. National HVAC Parts fitment guarantee — backed by exact-fit OEM sourcing for your Tempstar PTAC.

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...

$54.95

Frequently Asked Questions

Does this Thermostat fit my Tempstar THB12R25STA — Knob Control Kit | Ships Today?

Yes. This is the factory-specified OEM thermostat for the Tempstar THB12R25STA — Knob Control Kit | 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 THB12R25STA — Knob Control Kit | 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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