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High-Performance HVAC Resources

Current Category: Home and Building Performance

Fresh Air Requirements

Since the ASHRAE IAQ Standard 62 has been in turmoil for over a decade, we've put together a few rules of thumb to consider when designing and testing fresh air in homes and buildings. Fresh air intake = Occupants in a building X 15 CFM To maintain an adequate...

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Duct Leakage in Mechanical Rooms and CO

Mechanical rooms housing heating equipment are required to maintain a neutral or slightly positive pressure to prevent combustion gasses from being pulled back down the flue into the room. The only appliances that this would not affect would be sealed combustion or...

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Diagnosing Cooling Systems

Compared to the majority of the service techs in our industry, airheads have a distinct advantage when it comes to diagnosing cooling systems. The general idea that the system is "working" means it's typically only producing 60% or less of the equipment rated BTU...

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Design Vs. Redesign

We've looked, but can't find it.  There are mountains of information about how to design a new HVAC system, but nothing much that addresses how to redesign one. It would take hundreds of pages to completely detail the process, but let’s take a stab at the basic ideas....

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