NCI Article Library

High-Performance HVAC Resources

Empire Heating & Air Conditioning, Atlanta, GA

Martin Hoover, owner of Empire Heating and Air Conditioning of Decatur, Georgia, NCI Member of the Month.

Effective Air – Glenview Illinois

Jonathan Smith, owner of Effective Air, member of the month.

Dynamic Air – Las Vegas, NV

Contractor of the month, Tom Johnson of Dynamic Air in Las Vegas, Nevada.

Duct System Installation Don’ts

"Air doesn't do that!" is a common phrase uttered at NCI during seminars and tech support calls. When it comes to delivering the required airflow there are several field conditions that will cut the airflow short every time. Lonnie Robnett of Nevada Heating has...

Dress Up Your Duct Sealing

Most of us who seal metal ducts using mastic know how hard it is to neatly brush the mastic on joints. This is no big deal on ducts in attics or crawl spaces, where they'll never be seen, but can look kind of sloppy on exposed ducts in basements and equipment rooms....

Dealing with Low Enthalpy Change Across Coils

Over the past couple of months we had a number of tech support calls concerning low enthalpy change across cooling coils. Here's some information to consider next time you perform this wet bulb test. When taking wet bulb temperature readings before or after a cooling...

Davis Services, Inc. – Spartanburg, South Carolina

Davis Services, Inc., of Spartanburg, South Carolina is June’s NCT Contractor of the Month.

David Richardson, Richardson Heating and Air, Frankfort, KY

David Richardson cut his teeth in the industry in the low bid game of residential new construction air conditioning and heating. He works in a small family business and was thinking about getting out of it. He knew there was more to the HVAC industry, but didn't know...

Dave DeRose, Masterworks Mechanical, Inc., Craig, Colorado

Dave DeRose, President of Masterworks Mechanical, Inc., December’s NCI Member of the Month

Cracked Heat Exchangers – Test a Little Further?

Have you ever noticed a distinct change in CO readings when the blower comes on? Most technicians believe this indicates a crack in the heat exchanger. But could it be something else? We have found at least three scenarios that could cause this situation on Natural...