The quest for greater energy efficiency has been promoted by the government using utility company programs for more than a quarter of a century. This movement has made consumers aware that higher efficiency equipment is the right thing to use. Manufacturers have responded with higher efficiency equipment and contractors have consistently been able to increase …
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To be well prepared for this new level of diagnostics, begin collecting copies of the fan data found in most installation instructions for the equipment your company installs and services. The most important diagnostic truth about a system is that you can determine the amount of air the system fan is moving. Let’s take a …
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Static pressure measurement on commercial HVAC systems can vary significantly from one type of equipment to another. Commercial pressure testing also requires you to interpret and report internal equipment pressure drops. To remain savvy on the latest commercial air pressure testing, let’s take a look at this latest NCI commercial pressure testing update. Packaged Equipment …
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Economizers are  in the spotlight as a prime opportunity for energy savings in the commercial HVAC marketplace. It’s said, with little argument from those in the field, that nearly 80% of air-side economizers are non-functional. So if that’s true, opportunity is calling any mechanical contractor willing to step up and take this bull by the …
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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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