NCI Article Library

High-Performance HVAC Resources

Current Article Library Category: Air Conditioning

How to Determine Combustion Air Performance

Combustion air testing is performed using a draft gauge and a CO analyzer. When the draft in the flue of an appliance is low or below -.01" to -.02" W.C. and when CO reading are rising, combustion air problems are present. Carbon Monoxide diagnostics consistently...

How Airflow Affects Heating Efficiency

Airflow is critical to proper heat transfer in heating and air conditioning systems. Most of us know the rule that temperature drop over a cooling coil should be 18 to 22 degrees. If the temperature drop increases, it is evidence that airflow is low. If the...

HeatMaxx™ For Heat Pumps

Many NCI contractors have finally found an effective way to plug static pressure and performance measurement into your service departments by implementing the HeatMaxx and CoolMaxx programs. All we can say is that we wish we had come up with it sooner. Your feedback...

HeatMaxx and CoolMaxx Testing a Huge Success!

We're not quite sure what's driving it, but it appears the HeatMaxx and CoolMaxx service programs are becoming the newest shining stars among NCI-certified contractors. Perhaps it's the change to 13 SEER minimum efficiency equipment that has flipped a switch in...

Getting a Diagnostic Test From a Service Call

Besides the valuable information the reading provides to help resolve the service call issue, it can be a prime lead-in to selling a complete system diagnostic and potential duct renovation work. To provide your customers with air conditioning systems that perform as...

Generate New Work With CO & Combustion Testing

In addition to keeping your customers safe and saving them money, CO and Combustion Testing can be a very lucrative source of revenue for your contracting company. One of the main benefits of testing is the repair work it generates. These repairs are offered by few of...

Foley Mechanical – Alexandria, VA

Dan Foley is the President of Foley Mechanical serving the Washington DC Metro area. Foley Mechanical specializes in designing and installing hydronic heating systems, enhanced frequently by airside work. Dan started in the HVAC industry the Monday after he graduated...

Introducing NCI’s New Service Proposal

How many times in a week is your service technician placed in a situation where he or she finds a problem with a customer's system and when he approaches them with their options they're upset with the unexpected expense? You're stuck explaining options until they...

Include the Ducts in Your Service Agreements

Adding the ducts to your service agreements is one of the best steps you can take to move your company forward in implementing air diagnostics. It's a small thing that can bring great and immediate results. Spring is the perfect time to implement this new service....

Improving Duct Renovation Quality and Profits

NCI contractors have been testing and renovating duct systems for nearly a dozen years now. Every few years, we review the procedures and forms we provide to support your duct renovation work so they can be upgraded to keep up with the evolution of Performance Based...