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JD Kelly

Company name: A/C Direct & StudentofHVAC

Position: Owner

JD Kelly (also known as StudentofHVAC) is a licensed HVAC contractor and is the owner-operator of A/C Direct, an Alabama-based residential air-conditioning service business. JD is also the content creator for the StudentofHVAC social media pages and is a passionate enthusiast of HVAC training and education.

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Field Guide to Crankcase Heaters

Crankcase heaters are a critical but often overlooked component in air conditioning and refrigeration systems. Their function is simple but vital: to prevent liquid refrigerant from migrating into the compressor crankcase during the off-cycle. A missing or failed crankcase heater is a leading cause of premature compressor failure. This guide covers why they're necessary, how […]

Compressor Failure: Diagnosis and Replacement Checklist for Residential and Light Commercial Equipment

Special thanks to Ty Branaman and Bert Testerman for their work and feedback on this tech tip about compressor failure. A PDF checklist that covers all of the procedures in this tech tip can be found at http://www.hvacrschool.com/compressor-replacement-checklist. Important Note Before You Begin Industry data indicates that up to 30% of compressors returned under warranty […]

Voltage Protection Devices

As HVAC technicians, our responsibilities extend beyond the mechanical and refrigerant systems. The electrical power supply is an often overlooked factor in equipment longevity. Protecting an HVAC system from damaging voltage fluctuations is a strategic step that reduces service calls and enhances the reliability of our installations. This guide will discuss the importance of voltage […]

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Testimonials from the 6th Annual HVAC/R Training Symposium Part 2

Testimonials from the 6th Annual HVAC/R Training Symposium

UEI’s Latest HVAC Testing Tools | HVAC School at AHR 2025

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Is HVAC School Worth It?

In this comprehensive discussion, Bryan sits down with Brad Cooper, an experienced HVAC instructor from Arkansas, and JD Kelly, a trade school graduate, to tackle one of the most pressing questions in the HVAC industry: Is trade school worth it? Rather than offering a simple yes or no answer, the trio dives deep into […]

Superheat Talk w/ JD Kelly

In this episode of the HVAC School podcast, host Bryan discusses superheat with guest JD, who recently co-authored an article on the topic with Ty Branaman. The conversation explores the often misunderstood concept of superheat, its importance in HVAC diagnostics, and common misconceptions technicians have when measuring and interpreting it. Bryan begins by sharing […]

Delta T Talk w/ JD Kelly

Bryan from HVAC School interviews JD Kelly, known as “student of HVAC” on Instagram, about Delta T measurements in HVAC systems. This episode dives into the fundamentals of Delta T, common misconceptions, and proper measurement techniques. JD explains that Delta T is simply a temperature difference between two points of the same medium, which […]

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