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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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A2L Dissipation Boards and Leak Sensors

The HVAC industry's ongoing shift towards eco-friendly solutions continually introduces new challenges and learning opportunities. A2L refrigerants are at the forefront of this transformation, offering a lower global warming potential (GWP) than many of the refrigerants we’ve been using. They’re also mildly flammable, meaning they require some enhanced safety measures. One of these is the […]

Buck-Boost Transformers

HVAC systems often fail early or don't perform well due to inconsistent power. While technicians can't control a home's main power supply, they can stabilize it at the system using buck-boost transformers. These devices adjust voltage up or down to meet the equipment’s needs. As HVAC systems become more advanced, understanding buck-boost transformers will be […]

Upgrading a Single-Pole Contactor with a SureSwitch: Using a Wiring Diagram

Along the path to becoming a great HVAC technician lies the dreaded wiring diagram. It's meant to be a helpful map of the equipment's electrical system, but with its crisscrossing lines and cryptic symbols, it often feels more like a barrier than a guide. If this sounds familiar, you're not alone. But what if you […]

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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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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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