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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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Evaluating HVAC Tape Performance Under High Heat and Static Load (Part 1)

When sealing ductwork or repairing HVAC insulation, the tape you choose dictates the long-term integrity of the system. Temperatures fluctuate wildly in attics and mechanical rooms, and the tape must be able to withstand these environments without degrading. To better understand how different professional-grade adhesives actually perform under elevated temperatures, we decided to put them […]

The “Bad” Contactor That Wasn’t

I wanted to share a recent “rediscovery” with you out of pure humility. I call it a rediscovery because it’s a basic fundamental I already knew, but it just hadn't come up recently enough to be top of mind until the other day. I found myself troubleshooting a single-pole Mars 91311 contactor. I had voltage […]

Battery-Integrated HVAC Systems: The Concept of Load Shifting with Built-in Storage

Over the past several years that we’ve been discussing electrification as an industry, we’ve heard concerns about the electrical grid struggling with peak cooling demands. Within the past couple of months, the concept of integrating battery storage directly into HVAC equipment has emerged as a vital solution for load management. This concept turns a typical […]

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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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All About ESCO with Renee Tomlinson and MeasureQuick’s Latest Features with Jim Bergmann

In this short episode, the HVAC School team members talk with Jim Bergmann (measureQuick) and Renee Tomlinson (ESCO) about the latest and greatest that they brought to their booths at the 7th Annual HVACR Training Symposium. First, JD Kelly spoke with Renee about ESCO Institute's educational offerings. ESCO offers a mix of books and […]

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 […]

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