Uploaded April 2026 | Updated September 2026, 3 weeks ago
Ever find a random thermistor on an HVAC system and have no idea what it is? In this video, we show you exactly how to identify any thermistor using just a multimeter and a cup of ice.
Thermistors change resistance with temperature — so by locking in a known temperature (32°F/ice), you can measure resistance and cross-reference a thermistor chart to match your reading to a 10K, 20K, or 200K ohm type. No guessing, no part numbers needed.
Learn how to reverse-engineer HVAC components the smart way. Whether you're troubleshooting in the field or working with mystery parts, this trick will save you time every time.
Ever find a random thermistor on an HVAC system and have no idea what it is? In this video, we show you exactly how to identify any thermistor using just a multimeter and a cup of ice.
Thermistors change resistance with temperature — so by locking in a known temperature (32°F/ice), you can measure resistance and cross-reference a thermistor chart to match your reading to a 10K, 20K, or 200K ohm type. No guessing, no part numbers needed.
Learn how to reverse-engineer HVAC components the smart way. Whether you're troubleshooting in the field or working with mystery parts, this trick will save you time every time.
