Global positioning system (GPS) applications are growing in use because they allow continuous tracking of mobile workers to help improve scheduling and dispatching. A California contractor is now applying a new GPS service that is helping the company locate and manage employees at minimum expense through the use of cell phones.

This article addresses the two major abatement procedures for mold control: Moisture removal and microbial remediation. The first deals with denying fungi the moisture needed for growth; the second is the response to cleaning and removing mold from affected buildings.

Solenoid valves are highly engineered products that can be used in many diverse and unique system applications. Here is a brief overview of the components and functional varieties of solenoid valves.

Ultraviolet air treatment systems are fairly new to the HVAC industry, and there are still a lot of questions about how they work to treat the air. UV systems address the source of air quality problems by killing airborne bacteria and surface mold.

Mechanical refrigeration is accomplished by continuously circulating, evaporating, and condensing a fixed supply of refrigerant in a closed system. This article describes and illustrates the basics of the refrigeration cycle.

For nearly 50 years, fiberglass insulation has been used as a component of air duct systems to maintain comfort and IAQ. This article reviews insulation types, provides an installation overview, and discusses fiberglass duct insulation and IAQ.

A Southeastern governmental organization was convinced that updating its multiple HVAC installations with variable-frequency AC drives would achieve energy savings and lower maintenance costs. Its regulations as a county, however, required proof. A local contractor provided it.

The continuous concrete and narrow quarters of the big city are no impediment to a direct-access geothermal system. Contractor Mike Sumple took on the challenge in the heart of Manhattan and provided an energy efficient system.

This article provides the basics on energy recovery ventilators (ERVs): what they are, what they do, how they are installed, and service recommendations.

This article outlines the considerations involved to properly select, apply, and control fans. Emphasis is placed upon matching the fan equipment to the requirements of the system from several different perspectives.