Author: Ed Janowiak

Curious about what size you need for different pipe sizes? Learn how to determine and calculate hose size in this edition of “Hey Ed!”

Wondering if a system can hold a 500-micron vacuum of there’s moisture in the system? Learn when a system can hold a vacuum in this edition of “Hey Ed!”

Wondering what the difference between sensible heat ratio and sensible heat factor is? Learn how to use Manual S to find out in this edition of “Hey Ed!”

What’s the main problem when we make up a friction rate. Learn more about determining adequate airflow in this edition of “Hey Ed!”

Why is Manual S® Ed’s favorite manual? Learn about the importance of residential equipment selection in this edition of “Hey Ed!”

How do you describe electronically commutated motors Learn the difference between a constant torque and a constant air-flow in this edition of “Hey Ed!”

In this edition of “Hey Ed”, Ed discusses the difference between taking static pressure measurements on a new versus existing […]

What should you do if you can’t find the filter’s performance data? Find out what to do and in this edition of “Hey Ed!”

Should you take supply air measurements for discharge air temperature or relevant humidity? Learn how to get the best reading in this edition of “Hey Ed!”

Electrification and heat pumps are coming, and with them, many HVAC problems to look out for. Read this blog to learn more about heat pumps.

Want to know how to estimate latent capacity based on water coming out of the drain? Find out how to calculate latent capacity in this edition of “Hey Ed!”

Should you use different outdoor design conditions if you live on a heat island? Find out how to utilize Manual J in this edition of “Hey Ed!”

Why do I use the indoor design condition of 75 degrees at 50% relative humidity? Find the answer with Manual S and Manual J in this edition of “Hey Ed!”

Want to find the minimum velocity in a duct system? Find out how to use Manual D to find the minimum in this edition of “Hey Ed!”

Want to evaluate a system’s refrigerant charge without connecting any gauges? Find out how to wet-bulb for evaluation in this edition of “Hey Ed!”

Want to know what Oil Slugging is? Find out about compressors and oil backflow in this edition of “Hey Ed!”

What exactly is friction rate? Learn where to find the calculation rate in this edition of “Hey Ed!”