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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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Condenser Fan Blade Placement
In a previous article, I talked about wiring permanent split capacitor (PSC) condenser fan motors. While researching the topic, I realized that there isn’t as much information available on condenser motors as there is on their counterpart—the indoor blower motor. I had never really given it much thought, as I assumed that the condenser motor […]
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History of Thermometry and the Invention of Thermometers
So, what is thermometry anyway? Thermometry is the scientific study of measuring temperature and has roots that date back to as early as 220 BC. During this time, Philo of Byzantium began to study the effects that temperature had on air. Specifically, he observed expansion and contraction caused by temperature change. He did this using […]
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Electronic Expansion Valve Troubleshooting
Electronic expansion valves (or EEVs) are metering devices that you’ll find in a variety of modern HVAC equipment, including heat pumps, VRF units, inverter mini splits, and chillers. This valve is electronic rather than mechanical and can precisely control the flow of refrigerant into the evaporator and optimize efficiency for heating and cooling units.  Other […]
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