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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 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?

Hey Ed, What’s This Thing I Hear You Say About Turning the TV up When the System Comes On?

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Managing Expectations

Ed Janowiak reflects on an enlightening experience at the Westford Symposium, where Today’s Building Science’s Greg Stockton’s thought-provoking, evidence-backed question sparked a valuable conversation about good HVACR system design.

Hey Ed, What Should I Do When My Customers Complain That Their System Runs a Lot?

Hey Ed, Can You Give a Brief Summary of the Balance Points That We Deal With?

Hey Ed, Which Is Heavier Dry Air or Wet Air?

Hey Ed, Which Is More Accurate, the Heat Loss or Heat Gain That Comes From Manual J?

Hey Ed, What Happens When We Have Reduced Volumes for Branch Run and Go through a Supply Outlet Covering?

Hey Ed, How Does Manual D Deal with Variable Speed Systems?

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It Will Never Work

This blog is another take on a vital conversation that needs to be discussed with your customers, how the system is going to perform. Many customers are used to oversized equipment that can quickly drop the temperature in their house (and leave them feeling uncomfortable because it’s humid). It’s vital to have “the talk” when you’re sitting at the kitchen table. If you have “the talk” now, you won’t have the callbacks later.

Hey Ed, Can You Address Ventilation Loads if We’re Following Guidance Such as ASHRAE 62.2?

Hey Ed, Can You Please Comment on Things in a House That Are Intermittent Loads Like Dryer Bathroom Fans?

Hey Ed, Steven Asks at What Oversized Percentage Do We Start to Say ‘OK, That’s Too Much’?

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