Manual J
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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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Oversized HVAC Equipment
Manual J Load calculations can be manipulated to suggest heating and cooling demands that are said to require inappropriately sized systems
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The Impact of Air Leaks on Heating and Cooling Loads
A look into how Manual J calculates air infiltration and the ways that information affects the sizing of HVAC equipment
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Planning a Furnace-to-Ducted Heat Pump Retrofit, Part 3: Sizing Calculations
A comprehensive explanation of how to perform aggressive Manual J calculations to ensure properly sized HVAC equipment
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The Value and Limits of Manual J
These basic energy models can teach us more about our plans than what heating and cooling loads to expect
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Understanding Manual J Occupant Loads
How many people? Where and when do they get counted? How much do they contribute?
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How to Read Manual J Reports
If you know what to look for, it’s easy to check for accuracy
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There’s More to HVAC Design Than Sizing
Yes, size matters for for designing and sizing an HVAC system, but how the conditioned air is distributed matters more
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Converting Heating and Cooling Loads to Air Flow Needs
Here’s how Manual J software takes your inputs and gives you both the BTU/hour and cfm needed for each room
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The Difficulties of Third-Party HVAC Design
How do we get everyone on the same page?
