NCI Article Library

High-Performance HVAC Resources

Current Category: Airflow

Low Airflow and Thermostatic Expansion Valve Operation

Low Airflow and Thermostatic Expansion Valve Operation by David Richardson The effects of low airflow on the performance of an HVAC system have been taught by NCI for decades. One of the topics we don’t discuss as frequently is the relationship The effects of low...

Lonnie & Eric Robnett, Nevada Heating, A/C & Plumbing – Reno, NV

by National Comfort Institute, Inc.

Eric and Lonnie Robnett of Nevada Heating are quite a father-son team. Lonnie, the dad, is a true marketing guru and Eric the son, is a full-time air and combustion diagnostic testing and selling master. They have found success in their business together by separating...

Learning How to Test

by Rob "Doc" Falke

The last couple of days I've been on a number of phone conversations with a great HVAC contractor who is just learning to balance kitchen exhaust systems. He's new to air balancing, but committed and eager to be good at it. I've been impressed with the learning...

John’s Refrigeration December 2015 Member Spotlight

by Mike Weil

John's Refrigeration December 2015 Member Spotlight Mike Weil, NCI VP Communications & Publications Food for thought: Back in 1970, the U.S. was still embroiled in the Vietnam War, four college students lost their lives on the campus of Kent State University in...

Jack Davis, A-1 Mechanical, Las Vegas, Nevada

by National Comfort Institute, Inc.

Congratulations to Jack Davis, June's NCI Contractor of the month. We've been keeping an eye on Jack and his company since he attended an Air Balancing Seminar in January of this year and have been impressed with his ability to successfully implement Performance Based...

Is HVAC System Duct Leakage Testing Enough?

by David Richardson

Is HVAC System Duct Leakage Testing Enough? by David Richardson Duct leakage is an issue that has challenged the HVAC industry for as long as duct systems have been installed. The concept of resolving duct leakage issues isn’t a new one. If you have seen some of the...

Is Airflow Measurement Enough?

by Rob "Doc" Falke

Is Airflow Measurement Enough? Rob "Doc" Falke, NCI President Recently a long time successful NCI contractor contacted me concerning a light commercial project he was struggling with - a 7 ½ ton and a 5 ton unit servicing an office area with sixty uncomfortable women....

Interior Doors and Intermittent HVAC Comfort Problems

by David Richardson

Interior Doors and Intermittent HVAC Comfort Problems by David Richardson This cooling season, HVAC professionals across the country will be called upon to solve intermittent comfort problems they can't recreate. These frustrating and random problems often involve...

Insight Air, Phoenix, AZ

by National Comfort Institute, Inc.

Rick Rohrbacher is the owner of Insight Air located in Phoenix Arizona. In addition to having his second daughter two weeks ago and moving into their new home two weeks from now, it's been a very busy spring at for Rick and the rest of his company. As we spoke with...

How to Use Air Density Correction Factors

by Rob "Doc" Falke

Air density correction factors have been a part of our air balancing curriculum since the early 1990's. NCI published a small table years ago and encouraged you to make corrections for air density when measuring airflow at higher altitudes. But the accuracy you are...