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Tripp Lite SRCOOL12K Thermistor

In an HVAC system, a thermistor is a thermal resistor, whose resistance is directly proportioned to the amount of, or lack thereof, heat. They inform the circuit board when the temperature reaches a certain point. The HVAC system deciphers the temp in some specific areas of the system to do its job correctly.

General indicators that your your all-important thermister will soon need to be replaced

Check eBay to see if your thermistor is in stock!
If you are going to be buying or ordering any Tripp Lite SRCOOL12K part do your best and double check the correct model and also make a visual comparison in order to be sure the proper replacement thermistor is being ordered. You do not need to install it yourself. Hire someone with experience in your town or city to do the job for you.
Feel free to download your manual for help.
Check eBay for your thermistor!