Manual D
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The Manual J Dilemma
It’s hard to get a contractor to provide an accurate heat-loss or heat-gain calculation
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A Better Name for Friction Rate
Duct design is confusing enough already without having to explain why a higher friction rate is better
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The Difficulties of Third-Party HVAC Design
How do we get everyone on the same page?
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A New Online HVAC Calculator Is Available
Elite Software says its software works on smartphones, tablets, and internet-connected computers
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The Joy of Flex
A recap of my Building Science Summer Camp presentation
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How to Install Flex Duct Properly
Following the Air Diffusion Council's standards would lead to better installations
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When Do I Need to Perform a Load Calculation?
Part 4 in a series of articles on sizing heating and cooling equipment
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Saving Energy With Manual J and Manual D
Experts tell builders that HVAC equipment and ducts should be designed according to Manual J and Manual D; the problem is, no one wants to do the calculations
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Duct Leakage Testing
For an energy-efficient forced-air system, seal seams with mastic and test with a Duct Blaster
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Not all duct design manuals are created green
Manual D is about comfort, not energy efficiency. Its requirement in LEED-H makes green certification too expensive to justify the benefit. I've been building solar and green for 30 years.…
