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Carrier Factory Authorized Parts HH18HA449 OEM Temperature Actuated Switch – Furnace Limit Safety Control Replacement
Carrier Factory Authorized Parts HH18HA449 OEM Temperature Actuated Switch – Furnace Limit Safety Control Replacement
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Carrier HH18HA449 OEM Temperature Actuated Switch
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Specifications
Specifications
description
description
The Carrier Factory Authorized Parts HH18HA449 is an OEM temperature-actuated switch designed for compatible Carrier, Bryant, and Payne heating equipment.
This temperature-sensitive electrical component is used in furnace control and safety circuits to monitor operating temperatures. When the temperature reaches the switch's specified threshold, its electrical contacts change state, allowing the furnace control system to respond according to the manufacturer's designed operating sequence.
The HH18HA449 Temperature Actuated Switch is intended to replace a defective or malfunctioning original component in approved HVAC applications. Using the correct OEM replacement helps maintain the furnace's factory-designed temperature protection and electrical compatibility.
Ideal for professional HVAC maintenance and furnace repair, the HH18HA449 provides an equipment-specific replacement solution for compatible heating systems.
Key Features & Function
- Brand: Carrier Factory Authorized Parts
- Manufacturer Part Number: HH18HA449
- OEM Description: Temperature Actuated Switch
- Genuine OEM replacement component
- Temperature-sensitive electrical switching
- Supports furnace temperature monitoring and safety functions
- Designed for compatible Carrier, Bryant, and Payne equipment
- Equipment-specific mounting and electrical connections
- Factory replacement for approved heating applications
- Intended for professional HVAC service and repair
Product Details & Specifications
|
Specification |
Details |
|
Manufacturer |
Carrier |
|
Brand |
Factory Authorized Parts |
|
Manufacturer Part Number |
HH18HA449 |
|
Item Number |
HH18HA449 |
|
OEM Description |
Temperature Actuated Switch |
|
Product Type |
HVAC Temperature Actuated Switch |
|
Component Category |
Furnace Temperature & Safety Controls |
|
Primary Function |
Temperature-Activated Electrical Switching |
|
Equipment Application |
Compatible Heating Equipment |
|
Opening Temperature |
Verify manufacturer specifications |
|
Closing Temperature |
Verify manufacturer specifications |
|
Reset Type |
Verify manufacturer specifications |
|
Contact Configuration |
Verify manufacturer specifications |
|
Electrical Rating |
Verify manufacturer specifications |
|
Mounting Configuration |
Equipment-specific |
|
Terminal Configuration |
Verify original component |
|
Replacement Type |
OEM Factory Replacement |
|
Installation |
Qualified HVAC Technician Recommended |
Specification Note: The manufacturer description identifies HH18HA449 as a temperature-actuated switch. The exact opening temperature, closing temperature, and reset characteristics have not been independently verified.
HVAC Depot Pro Tip
A furnace temperature switch may activate because of an overheating condition rather than a defective switch.
Before replacing the Carrier HH18HA449, inspect the furnace for restricted airflow, improper blower operation, damaged wiring, or other conditions that could cause excessive temperatures.
Recommended diagnostic checks:
- Confirm the furnace model and serial number.
- Verify the original switch part number is HH18HA449.
- Inspect the furnace for signs of overheating.
- Check air filters, ductwork, and blower operation.
- Inspect the switch terminals and wiring connections.
- Test the switch according to manufacturer instructions.
- Confirm the replacement has the required temperature ratings and mounting configuration.
HVAC Depot Pro Tip: Never substitute a temperature switch based solely on physical appearance. Different switches may have different temperature ratings, reset characteristics, and electrical specifications.
Important: Never bypass or jumper a furnace temperature safety switch. Repeated switch activation requires diagnosis of the underlying equipment condition.
Disconnect electrical power before servicing. Installation and testing should be performed by a qualified HVAC technician.
Equipment / Model Compatibility
The Carrier HH18HA449 is intended for select Carrier, Bryant, and Payne heating equipment requiring this specific OEM temperature-actuated switch.
Exact compatible equipment models have not been independently verified.
Before ordering, confirm the complete equipment model number, serial number, original switch identification, and manufacturer-approved replacement information.
Compatibility Notice: HH18HA449 is not a universal temperature switch. Confirm manufacturer-approved compatibility before purchasing.
Specification
Specification
Refund policy
Refund policy
Refund & Return Policy
Last Updated: June 2026
At HVAC Parts & Equipment Depot, customer satisfaction is important to us. This Refund & Return Policy explains how returns, exchanges, and refunds are handled for purchases made through TopHVACParts.com.
Return Eligibility
We accept returns within 30 days of delivery.
To qualify for a return:
- The item must be unused, uninstalled, and in its original condition.
- The item must be returned in its original packaging.
- Model numbers and serial numbers must match the original purchase records.
- Proof of purchase or order confirmation is required.
Non-Returnable Items
The following items are not eligible for return or refund:
- Installed or used parts.
- Products showing signs of installation, modification, or damage caused after delivery.
- Items missing original packaging.
- Sale or clearance items.
- Special-order or custom-order products.
- Returns requested more than 30 days after delivery.
Restocking Fee
Approved returns may be subject to a 20% restocking fee.
The restocking fee will be deducted from the refund amount after the returned item has been inspected and approved.
Damaged, Defective, or Incorrect Items
If you receive a damaged, defective, or incorrect item, please contact us within 7 days of delivery.
Email: support@tophvacparts.com
Phone: (214) 734-5222
We may request photographs and additional information to help process your claim.
If the claim is approved, we will provide a replacement, exchange, or refund at no additional cost to you.
Exchanges
We replace items only if they are defective, damaged upon arrival, or incorrectly shipped.
To request an exchange, contact us at:
Refund Process
Once your return is received and inspected, we will notify you by email regarding approval or rejection of your refund request.
If approved:
- Refunds will be issued to the original payment method.
- Processing typically takes 7–14 business days after approval.
- Your financial institution may require additional time before the refund appears in your account.
Return Shipping
Customers are responsible for return shipping costs unless the return is the result of:
- Our shipping error,
- A defective product,
- A damaged product received upon delivery.
Original shipping charges are non-refundable.
We recommend using a trackable shipping service and purchasing shipping insurance for higher-value items.
Return Address
HVAC Parts & Equipment Depot
1135 E Plano Parkway, Suite 8
Plano, TX 75074
United States
Professional Installation Notice
Many HVAC products require installation by a licensed HVAC professional.
HVAC Parts & Equipment Depot is not responsible for damages resulting from improper installation, misuse, unauthorized modifications, or failure to follow manufacturer instructions.
Special Orders
Special-order products must be picked up within 30 days of purchase unless other arrangements have been approved.
Unclaimed special-order products may be returned to the manufacturer and may be subject to applicable restocking fees.
Contact Us
If you have questions regarding returns, refunds, or exchanges, please contact us:
HVAC Parts & Equipment Depot
Phone: (214) 734-5222
Email: support@tophvacparts.com
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Happy Shouts From Our Thrilled Customers
William Bartlett
Cecil really saved me with troubleshooting tips over the phone. Thought I was going to have to replace the blower motor and ended up only needing a motor run capcitor. Thank you and God bless!
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Riley Connolly
Cecil and Fidel were absolutely amazing and so helpful. We were happy they were open on Sunday, but was impressed with their knowledge and willingness to make sure we had everything we needed. If you need parts or service or install, I would recommend.
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Cole Meger
Our AC went out during the hottest stretch of summer, and with a one-year-old at home, we were desperate for a quick fix. These guys came through big time — not only did they source the part faster than anyone else in the area, they also walked me through DIY troubleshooting while I waited. Trustworthy, knowledgeable, and run by a solid local family. As someone who owns rental properties nearby, I’ll be sourcing all my HVAC parts from them moving forward. Highly recommend!
Verified Buyer
Carl T. Droste
Had a power outage last night and during the 100 degree heat today noticed that the AC was not blowing any cold air. Pulled the capacitors to have them checked and also took video of the relay making noise even with the breaker was off. The proprietor and her staff were very friendly and helpful. She had the video analyzed and confirmed something was wrong. She checked one of the capacitors was a little low. Capacitor replacement is the biggest ticket item for HVAC repair. It is hundreds of dollars with the a capacitor only about $20.
Verified Buyer
Fuzzy Wuzzy
Cecil and his family have been a life saver. I walked in with very little knowledge on parts let alone how to repair my unit. All I had was my brother in FL who knows more than I do and Cecil at HVAC Depot. With 2 young kids at home I couldn't afford to wait for a HVAC tech. Cecil walked me through what I needed to know, even after hours when the shop closed. I successfully repaired the fan motor and replaced the capacitor. Thank you HVAC team for being totally awesome. Prices were amazing and I'm forever going to support this small family business. You and your family are what Texas is all about!!!
Verified Buyer
Linda Robinson
I called HVAC Depot and was absolutely blown away by the fast, courteous and exceptional service. They were very knowledgeable about explaining what they were doing and what had happened to the ac system. If you ever need a HVAC team they are best and they won’t hesitate by coming out and they won’t leave until you are happy with the service. Thank you so much for your excellent service. Kudos to you Michelle for your amazing customer service.
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Paul Hamer
My AC went out in our home on Friday night. I went out and got the capacitor details and took them here first thing Saturday morning. Lady at the counter was friendly and had the capacitor I needed! When I got home, I installed the capacitor and AC is all good!!
Verified Buyer
Jeff Ledesma
Awesome support and had everything I needed for an older unit! Then helped me out with the DIY!! Air conditioning back up and running at 100%!!
Thanks for everything
Verified Buyer
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