NCI Article Library

High-Performance HVAC Resources

Four Seasons Air Conditioning and Heating Company, Kingsville, TX

Jim Altman, President of Four Seasons Air Conditioning and Heating in Kingsville, Texas, September’s NCI Contractor of the Month.

Five Minute Duct BTU Loss/Gain Procedure

We've all heard our customers describe how their air conditioning system works O.K. in the morning, but doesn't deliver enough cooling in the afternoon. We send out a service tech, he services the unit and reports it's working pretty well. End of story, except our...

Find CFM By Measuring Coil Drop on New Installs

There's a fast test for a new installation that is highly accurate and takes just a few minutes. You can get system CFM by measuring pressure drop over a new coil. You simply plot the pressure drop on the coil engineering data sheet and read the airflow passing...

Do You Know How External Filter Racks Impact Total External Static Pressure?

Do You Know How External Filter Racks Impact Total External Static Pressure? A few weeks ago I was asked a question about finding the proper location to obtain the entering static pressure reading on an upflow gas furnace using an external filter rack. This is one of...

Farris Electric, LLC

Chris Farris, Farris Electric, LLC in Durant, Oklahoma is NCI’s November Member of the Month.

Estimating Heating Equipment Size and Airflow

An essential part of diagnostic testing is communicating your findings to your customers. Your success will be in direct proportion to your ability to help them understand the impact of system performance on their comfort, pocketbook, health and safety. Back when...

Enhance Revenues With Commercial Air Conditioning Diagnostics

How would you like to generate additional revenue using Air Diagnostics with your existing commercial customers? If you currently have service agreements with commercial accounts, consider contacting property owners and managers to offer them a service that enhances...

Empire Heating & Air Conditioning, Atlanta, GA

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

Duct Sizing Made Easy

ACCA manual D and other similar programs are the industry standards for duct sizing. But from hundreds of unofficial polls conducted in our seminars, we have learned that in the "real world" these programs are used for designing less than 1% of the residential and...

Duct Loss Test Methods – Which to Use When?

Duct Loss Test Methods - Which to Use When? By: Rob "Doc" Falke, NCI President NCI has a number of duct loss test methods that can help identify defects in duct systems. But when it's time to test in the field, you have to quickly determine what test will be most...