Hey Ed, is 400 CFM always the correct airflow?
In this edition of “Hey Ed,” Ed discusses the correct airflow.
Author: Ed Janowiak
Ed Janowiak is ACCA's Manager of HVAC Design Education and can be reached at ed.janowiak@acca.org or 703-824-8878.
Hey Ed, What’s the difference between 100 CFM coming out of a metal duct or a flex duct?
In this edition of “Hey Ed,” Ed discusses the difference between a metal duct and a flex duct when 100 CFM is going through it.
Hey Ed, Does the new Manual S® still have a path to size based on AC requirement?
In this edition of “Hey Ed,” Ed discusses the path to size based on AC requirement in Manual S.
MEMBER EXCLUSIVE
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Can you trust ChatGPT?
I have mixed feelings about ChatGPT — so I asked it directly. ChatGPT said: That’s a fair and important question. The honest answer is: you can trust ChatGPT for many things, but not everything. Here’s a breakdown:
Hey Ed, does the new Manual S® have a lot of changes?
In this edition of “Hey Ed,” Ed discusses the latest changes to Manual S.
Hey Ed, why does Manual J® use one person per bedroom plus one in the data collection part of the survey?
In this edition of “Hey Ed,” Ed discusses the Manual J calculations for bedrooms.
Hey Ed, does placing the outdoor unit for a HP or CAC under the house make sense if there is enough clearance above for airflow?
In this edition of “Hey Ed,” Ed discusses placing an outdoor unit under the house.
Hey Ed, should we try to place the outdoor unit for a HP or CAC in the shade?
In this edition of “Hey Ed,” Ed discusses placing an outdoor unit in the shade.
MEMBER EXCLUSIVE
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Why are dehumidifiers in the basement if moist air is lighter than dry air?
If moist air is lighter than dry air, basement dehumidifiers seem to defy basic physics. A contractor’s simple question reveals a complex building science principle in this members-only exclusive.
Hey Ed, are returns required in every room?
In this edition of “Hey Ed,” Ed discusses Manual D’s requirement of an uninterrupted path for the air to come out of a supply outlet and get back to the fan.
Hey Ed, is all air standard?
In this edition of “Hey Ed,” Ed discusses the weight of a cubic foot of standard air.
Hey Ed, what is the most efficient way to connect a return duct to an air handler?
In this edition of “Hey Ed,” Ed discusses the most efficient ways to connect a return duct to an air handler.
Hey Ed, do we ever try to get our systems to meet AHRI SEER2 operating efficiency?
In this edition of “Hey Ed,” Ed discusses AHRI SEER 2 operating efficiency in system design.
Hey Ed, can you give me a brief description of what COP means?
In this edition of “Hey Ed,” Ed discusses the coefficient of performance for HVAC systems.
Hey Ed, what’s this thing I hear you say about turning the TV up when the system comes on?
In this edition of “Hey Ed,” Ed discusses the importance of low-noise systems.
Hey Ed, can you give a brief summary of the balance points that we deal with?
In this edition of “Hey Ed,” Ed discusses thermal and economic balance points.
Hey Ed, how do I avoid committees?
In this edition of “Hey Ed,” Ed discusses the importance of showing up to the meetings.
Hey Ed, which is heavier? Dry air or wet air?
In this edition of “Hey Ed,” Ed discusses the weight of dry air versus wet air.
