Why is my Superheat and Subcool Too High or Too Low?

Are your superheat or subcool readings way too high or too low and you can’t figure out why? Don’t worry—you’re not alone. Every HVAC technician runs into confusing numbers when diagnosing an AC or refrigeration system, and this video will walk you through exactly what’s happening and how to fix it.

In this video, Tom breaks down what superheat and subcool mean, why they matter in system performance, and the most common causes when readings are outside of spec. You’ll learn how improper charge, restricted airflow, dirty coils, TXV issues, or even ambient temperature conditions can throw your numbers off. Most importantly, you’ll discover the right way to diagnose whether the problem is with the refrigerant charge, airflow, or the metering device, so you don’t waste time replacing parts that aren’t bad.

By the end of this training, you’ll know:

- The difference between high superheat / low subcool vs low superheat / high subcool conditions.

- How to spot whether your system is overcharged, undercharged, or airflow restricted.

- Why balancing superheat and subcool is critical for system efficiency and compressor longevity.

- Proven tips to nail your charging process and avoid costly callbacks.

If you’re serious about becoming a better HVAC technician, this video is a must-watch. Whether you’re troubleshooting residential AC units, refrigeration systems, or commercial rooftop units, understanding superheat and subcool will make you faster, more accurate, and more confident on every service call.
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. All HVAC repair work is done at your own risk. Ideal Conditions Heating & Air Conditioning, Inc. is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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