HVAC professionals across the country are experiencing a recent change that is driven by energy codes. This change is related to duct-leakage testing on new and often retrofitted HVAC systems. A lot ...

The analog manometer, commonly referred to as a Magnehelic ®, is a test instrument that has been around the HVAC industry for decades. Among many technicians in the field, it is still the test ...

Dear Jim: We are considering installing a heat pump or central air conditioner. We currently have radiant heating. I have heard mini-duct systems are very comfortable and quiet. How do they work? Jack ...

Thermohydraulic simulations can provide detailed heat recovery steam generator (HRSG) data to help determine the root cause of failures, predict the degree of wear from various mechanisms, and assess ...

A small-duct high-velocity system was used in this Johns Island, SC house. The ducts vents can hardly be seen. The house was designed by Architect Sam Rashkin. Energy Star estimates that 20% to 30% of ...