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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 with the gray refrigerant tanks? Did the refrigerant manufacturers run out of colors?

In this edition of “Hey Ed,” Ed discusses gray refrigerant tanks.

Hey Ed, are digital gauges better than analog gauges?

In this edition of “Hey Ed,” Ed discusses digital gauges versus analog gauges.

Hey Ed, is there a new EPA 608 certification for A2Ls?

In this edition of “Hey Ed,” Ed discusses the new EPA 608 certification for A2Ls.

Hey Ed, is A2L to be charged as a liquid?

In this edition of “Hey Ed,” Ed discusses how A2L can be charged as a liquid.

Hey Ed, is zeroing your gauges calibrating them?

In this edition of “Hey Ed,” Ed discusses how zeroing your gauges is not the same as calibrating them.

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Manual D

Manual D® or duct design: How are you calculating airways?

Something I’ve observed for quite some time, but it seems to need more attention lately, is how we are actually sizing airways— commonly referred to as ductwork. I appreciate when people say they’re using the Manual D® process when discussing duct designs.

Hey Ed, what does our coil temperature (suction saturation temperature) look like?

In this edition of “Hey Ed,” Ed discusses suction saturation temperatures.

Hey Ed, what is the difference between an air handler, a fan coil, and a furnace?

In this edition of “Hey Ed,” Ed discusses the differences between air handlers, fan coils, and furnaces.

Hey Ed, Will asks, “What’s your favorite go-to Manual D® software?”

In this edition of “Hey Ed,” Ed discusses the best way to do your Manual D® calculations.

Hey Ed, what is a duct sketch?

In this edition of “Hey Ed,” Ed discusses the uses of a duct sketch.

Hey Ed, can a duct be too big?

In this edition of “Hey Ed,” Ed discusses duct sizes.

Hey Ed, can a home’s location be substituted for another location with similar weather?

In this edition of “Hey Ed,” Ed discusses substituting a home’s location for another.

Hey Ed, what is comfort?

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Is it necessary to have a return duct in every room? 

Is one return enough? Had a conversion will a fella about a topic I hear about far too often. He had someone ask (require) for there to be a return in every room. I knew Manual D® didn’t say that.

Hey Ed, should I use the word “comfort” in my contracts?

Hey Ed, is there a difference between a block load and a room-by-room load?

Hey Ed, a contractor asks when calculating for the eaves with gutters that are 29″ long and all the windows are 3″ from the top overhang – is this normal?

Hey Ed, our code requires a supply grille in every room even if Manual J® calls for zero CFM. Any advice?

Hey Ed, Do We Ever Try to Get Our Systems to Meet AHRI SEER2 Operating Efficiency?

Hey Ed, What Is This COP Thing That I Keep Reading About?

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