A recent evaluation of several hundred commercial rooftop systems around the country exposed a hidden flaw that deteriorates system efficiency up to 40% — Rooftop equipment curbs. Let’s take a look at how you can quickly diagnose and solve curb problems you may encounter in the field. What’s a Curb? A curb is a pre-fabricated …
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A service manager reviewing the week’s service records called me to report a tell-tale pattern he discovered. He found most technicians consistently repeat the same 10 to 15 repairs. Let’s take a look at the impact on your customers and company when technicians slip into autopilot and fail to search for performance-based solutions. Performance-Based Service …
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For five decades air balancing has been specified by mechanical engineers on nearly every commercial project. In recent years, air balancing has moved into the energy efficiency market as a method of verifying the operating performance of both residential and commercial HVAC systems. Let’s take a look at how new air balancing reports are placing …
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Blood Pressure Monitor

When replacing HVAC equipment, better service companies offer duct upsize and system performance upgrades as an option to their customers. These upgrades allow the duct system to perform closer to the level of efficiency claimed by the equipment manufacturer. Let’s take a look at the steps necessary to effectively upsize a residential duct system. Why …
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Stacked pebbles represent stability in HVAC systems

When testing and diagnosing the operation and performance of an HVAC system, the timing and measurement are critical. Ideally, the system should be calling for full heating or cooling, and fan speed so it can reach a stable operating condition. Let’s take a closer look at what constitutes stable operating conditions so your test data …
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When it comes to ethics, I love to tell this story. I once called a plumbing service company to investigate a leak in our shower above the kitchen. They quoted me $195.00 for the work. Two hours later I had five holes in my kitchen ceiling, a messy bathroom, and no conclusive source of the …
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HVAC Airflow and leaf blowing -- the common denominator

Let’s talk airflow. We live back in the woods on a half-acre with fifteen 100-foot tall oak trees. For years I’ve imagined sharing leaf blowing airflow lessons with my fellow airheads. Let’s take a look at the mad airflow skills you can master while blowing leaves. Fascinating Statistics “If you don’t measure, you’re just guessing.” …
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Benchmarking

Responses from an article on benchmarking that ran in Contracting Business.com magazine’s Hotmail email newsletter nearly a year ago continue to appear in my inbox. This new field evaluation and test method is being included in progressive service and maintenance agreements throughout the industry. It is proving as beneficial to customers as it is for …
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When it comes to duct work, there’s lots of discussion  kicking around about them being substantially undersized. Here’s a two-minute test that can check the size and performance of your duct system. The instruments are inexpensive and it takes less than 10 minutes to learn to do. Tons of Air Static pressure is a measurement …
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Measuring static pressure

Like blood pressure in humans, static pressure impacts HVAC systems, positively or negatively, depending on what that pressure is. We all know that high or low pressure is bad for human health. The same is true when it comes to building static pressure as well. Taking a building’s static pressure lets you “see” the HVAC …
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