Q: Tim, I've got a forced-air furnace. Several rooms in my house are cold in the winter and are hot and stuffy in the summer when the AC is on. Most of the rooms are comfortable. Why do you think this ...

Manual D Ductsize (MDD) is a fast and simple program designed for sizing and analyzing HVAC duct systems based on the Air Conditioning Contractors of America’s (ACCA’s) Manual D procedures. It ...

The shortest distance between two points is a straight line, but when it comes to your duct work that may not be the best path for an efficient system that cools and heats the home properly.

Syska Hennessy Group, the international engineering firm, has launched an app called the Ductulator, which helps architects, owners, contractors, and mechanical engineers easily determine and specify ...

When selecting inverter driven systems, the contracting community tends to ignore sizing issues because the popular belief is: The system will run only as necessary — you can’t oversize. Nothing could ...

The Guys have said for years the forced air heating systems in many homes are the “poor stepchild” of the mechanical systems. Homes are historically wired, then plumbed, then the duct work is ...

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 ...