BACK

#grit

Tech Tips:

HVAC Ghosts of Christmas Past, Present, and Future

There have been many adaptations of A Christmas Carol over the years, but it all started with a novella written by Charles Dickens in the 1840s. It was early in the Victorian Era, fresh off the heels of the Industrial Revolution. The British were reflecting on past Christmas traditions, like caroling, and exploring new ones […]

Learning and Teaching GRIT w/ Ty Branaman

In this episode of the HVAC School podcast, host Bryan Orr and guest Ty Branaman have an in-depth, hands-on conversation about the philosophy, structure, and impact of GRIT Camps—workshops designed to introduce kids to the trades through immersive, practical experiences. The episode opens with reflections on a recent successful GRIT Camp in New Jersey, […]

Check out our most recent video

How to Evacuate an AC system, Full Vacuum Procedure

Our latest Podcast

HVAC School – For Techs, By Techs

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

In this informative episode, host Bryan welcomes guest Bert for an in-depth discussion on the often-overlooked but critically important topic of electric heat in HVAC systems. The conversation takes listeners through both the common and uncommon issues that arise with electric heat installations, offering practical insights drawn from years of field experience. Bryan and Bert balance technical expertise with relatable storytelling, making complex electrical concepts accessible to both HVAC professionals and homeowners interested in understanding their heating systems.

The discussion begins with some of the more dramatic (and rare) scenarios, including tales of objects left on heat strips during installation—from instruction manuals to spray glue cans—that have led to fires and property damage. These cautionary tales serve as memorable reminders of the importance of proper installation practices. The conversation then shifts to the far more common issues technicians encounter regularly, particularly loose electrical connections. With electric heat strips drawing substantial continuous amperage—often 20 amps per 5kW or more—poor connections can quickly lead to melted wire nuts, damaged terminal blocks, and potentially dangerous situations. Bryan and Bert emphasize that these connection problems often don’t manifest until the heating season begins, making proper installation and inspection critical.

Bryan and Bert also address widespread confusion around emergency heat versus auxiliary heat, explaining why emergency heat settings are largely obsolete in most modern heat pump applications. They clarify that in typical residential installations with 5-10kW heat strips, the electric backup cannot efficiently heat an entire home on its own, making the emergency heat function impractical. Instead, auxiliary heat should work in tandem with the heat pump to supplement heating during extremely cold conditions or defrost cycles. The hosts advocate for implementing lockout controls that prevent auxiliary heat from activating unless outdoor temperatures drop below 40 degrees, helping homeowners avoid unnecessarily high electricity bills while still maintaining comfort.

The technical discussion extends to critical safety mechanisms, including interlocks, thermal overloads, and fusible links that prevent catastrophic failures. Bryan provides historical context on how interlock systems have evolved from high-voltage relay-based designs to modern control board logic, while warning against improper retrofitting that can create new hazards. The episode concludes with practical guidance on proper sizing, voltage considerations, airflow requirements, and the economics of electric heat versus other fuel sources. Throughout the conversation, Bryan and his guest stress that while electric heat is simple and reliable, it demands respect for proper electrical practices and thoughtful system design to ensure both safety and cost-effectiveness.

Topics Covered

Installation Horror Stories and Safety Hazards: Objects left on heat strips causing fires, including the infamous spray glue can incident
Loose Electrical Connections: The #1 issue with electric heat systems and why continuous high amperage makes proper connections critical
Wire Sizing and Breaker Matching: Common mistakes when replacing furnaces with heat pumps and the dangers of undersized wiring
Emergency Heat vs. Auxiliary Heat: Why emergency heat is largely obsolete in modern residential applications and when auxiliary heat should actually engage
Heat Output Calculations: Understanding BTU production per kilowatt (3.41 BTUs per watt) and why 5-10kW strips can’t heat most homes alone
Lockout Controls and Outdoor Thermostats: Implementing temperature-based restrictions to prevent unnecessary auxiliary heat operation above 40°F
Interlock Systems Evolution: How blower/heat strip safety interlocks have changed from relay-based to control board logic
Thermal Overloads and Fusible Links: The two types of safety devices that prevent overheating and fire hazards
Defrost Cycle Operation: How auxiliary heat integrates with heat pump defrost sequences
Balance Point and Dual Fuel Considerations: Economic and operational factors in choosing between electric and gas backup heat
Voltage Variations and Sizing: Working with different voltage ratings (208V vs. 240V) and how they affect heat output
Diagnostic Techniques: Using Ohm’s law and resistance measurements to verify heat strip operation and specifications
Airflow Requirements: Why proper air movement is critical for preventing overload trips and premature failures
Electrical Safety Practices: Avoiding dangerous shortcuts like bypassing thermal limits or using undersized relays
Energy Efficiency and Economics: Comparing the true cost-effectiveness of electric heat versus gas and heat pump operation

Have a question that you want us to answer on the podcast? Submit your questions at https://www.speakpipe.com/hvacschool.

Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at https://hvacrschool.com/symposium.

Subscribe to our podcast on your iPhone or Android.

Subscribe to our YouTube channel.

Check out our handy calculators here or on the HVAC School Mobile App for Apple and Android.

Search Episodes

Electric Heat Talk w/ Bert

02/05/2026

Bryan Orr

Vapor Diffusion Ports, Hygric Buoyancy, and Fruit – Short #277

02/03/2026

Bryan Orr