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HVAC - Tech Tips & Charts

Boost your knowledge of HVAC maintenance, calculations, standard operations and more with our technical insights, tips and charts.

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HVAC - Tech Tips & Charts

HVAC Tech Tip - Wiring an RDS to a Non-Communicating Furnace with an ECM Motor Issue

by Coburn's HVAC Tech Team

July 01, 2026

When connecting an RDS to a non-communicating furnace with an ECM motor, the wiring sequence matters - follow these steps to get it right the first time.Need a copy for your service truck?📥 Download Chart PDF  ...
HVAC - Tech Tips & Charts

HVAC Tech Tip - Superheat & Subcool Reference Chart

by Coburn's HVAC Tech Team

May 27, 2026

Superheat and subcool readings tell you a lot about what's happening inside a refrigerant system.Used together, they can quickly point you toward the root cause of a problem — from low charge to a restricted metering device. Use the interactive chart...
HVAC - Tech Tips & Charts

HVAC Tech Tip - Wiring a Legacy Thermostat with Communicating Outdoor and Indoor Equipment

by Coburn's HVAC Tech Team

May 01, 2026

A legacy thermostat doesn't prevent communicating equipment from doing its job. The outdoor and indoor units will still talk to each other through the RDS, and the wiring to the furnace remains the same whether you have a fully communicating system o...
HVAC HVAC - Tech Tips & Charts

Understanding AFUE: What It Means for Homeowners and Why It Matters

by Coburn's HVAC Tech Team

December 01, 2025

Understanding AFUE: What It Means for Homeowners and Why It MattersDate: December 1, 2025By Rick Kincel, Coburn’s HVAC Tech Services Manager   Voted One of the Top 25 Most Influential Instructors/Trainers of 2026When choosing a residen...
HVAC - Tech Tips & Charts

HVAC Tech Tip - Calculating Total Heat Transferred

by Coburn's HVAC Tech Team

June 02, 2025

How do you prove that a system is actually delivering its rated cooling or heating capacity? The answer lies in thermodynamics. In this field guide, we break down the total heat formula and show you exactly how to measure sensible and latent heat ch...
HVAC - Tech Tips & Charts

HVAC Tech Tip - Calculating CFM in the field

by Coburn's HVAC Tech Team

June 02, 2025

Proper airflow is the backbone of high-efficiency HVAC performance, but you don't always need an expensive flow hood or velometer to measure it. In this quick guide, learn the precise formulas and step-by-step setup required to calculate Cubic Feet p...
HVAC - Tech Tips & Charts

HVAC Tech Tip - Are the tools you count on for accuracy, accurate?

by Coburn's HVAC Tech Team

June 01, 2025

In the HVAC/R industry, your tools are your eyes and ears. But when was the last time you actually verified their accuracy? Working with miscalibrated multimeters, manometers, or temperature probes can lead to misdiagnosis, wasted hours, and costly c...
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