In this troubleshooting situation you have responded to a complaint that a 4-ton package unit air conditioner is not cooling.

The customer’s description of the problem: “My air conditioner is blowing warm air.” What's causing this?

Accurately calculating heating and cooling loads — or the requirements of a home — is an essential element of properly sizing an HVAC system.

In this troubleshooting situation, the equipment is a gas pack that has been in service for 18 months. What is the underlying cause for the poor performance of this unit?

In one of its sections on TXVs, the book points out that “this component is widely used for nearly all types of air conditioning and refrigeration systems. The advantage of the TXV is its ability to automatically adjust to match the load, as it is designed to sense changes in the refrigeration load and respond to them.”

A large entity using its size and resource muscle to carve out business at the expense of smaller companies may elicit a David-versus-Goliath reaction from many.

If a condenser coil is dirty or fouled, its ability to reject heat is severely affected.

HFCs were created to take the place of HCFCs, but they, too, are being targeted for a phasedown and are likely to be replaced by HFO blends.

From boilers to rooftop units to VRF systems, each technology offers a unique set of benefits sure to keep commercial customers — and their tenants — happy.