In this troubleshooting situation, the customer’s complaint is that their office air conditioner is “not cooling at all.”

Systematic troubleshooting using the symptom/cause method is a quick and efficient way a service technician can solve even the toughest of service calls.

The "magic number" 1.08 is convenience factor. It is a bunch of math combined into one factor as a shortcut, although sometimes more precise calculation is better.

In this month’s troubleshooting situation, the equipment that needs servicing is a split system and the refrigerant flow control is handled via an EEV.

For Arlyn L. (“Duke”) Moore, making the industry better means inventing a product to make technicians’ jobs easier.

Don’t assume equipment capacity or conditions. Instead, do some digging and find the tables for the equipment you install and service.

The customer is complaining that the temperature inside their small convenience store won’t get comfortable in the warmer part of the day.

Contractors can benefit from knowing the advantages of high-end comfort technology, how to service it, and how to sell it.

Poorly installed HVAC systems work twice as hard as they should and suffer from a wide variety of invisible health problems.

Contractors want both timely and successful troubleshooting. Experience helps technicians achieve both.