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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, 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’?

Hey Ed, Is There Much of a Difference Between the Thermal Balance Point on a HP That We Calculate Versus We Observe in the Field?

Hey Ed, When Doing an Energy Audit, I’m Finding Houses With Hot and Cold Rooms

Hey Ed, What Is the Plans Review Form?

Hey Ed, What Is the Difference Between Duct Design and Manual D?

Hey Ed, Why Do We Reduce Ducts?

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What kind of damper are you using?

In HVACR systems, the term “damper” can refer to various types of devices used to regulate airflow. Here are some common types of dampers, including those that might come up in a discussion related to Manual D®, which is a methodology for sizing residential duct systems. 

Hey Ed, Chris Says He Has Always Been Taught to Only Have Staggered Takeoffs

Hey Ed, Chris Asks Why Do We Stagger Ducts?

Hey Ed, If I’m Only Going to Change the Outdoor Unit Out, Is the Oil in the System of Concern?

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Measurements, Not Eyeballs!

In the HVACR industry, it’s all too common to hear comments about ductwork being too big or too small based solely on appearance. Similarly, there are far too many comments that a system will never condition a space properly just by looking at it. While everyone is entitled to their opinion, there is a significant difference between opinions based on expectations and those grounded in precise measurements.  

Hey Ed, Nathan Asks What in the World Are You Talking About Regarding ‘Oil Already in Your Furnace’?

Hey Ed, Sean Mentions All Filter Manufacturers Recommend 300 Feet per Minute Velocity Through a Filter

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