There are four major manufacturers of centrifugal chillers:

More than 40 companies manufacture evaporative cooling equipment. Here are several of the leading suppliers.

The largest manufacturers are:

For further background information, the Air-Conditioning, Heating and Refrigeration Institute offers downloadable versions of the current unitary equipment standards at its web site. It also offers a list of links to other efficiency-related or HVAC-related sites and organizations.

As with other appliances, different brands of room air conditioners may be made by a single manufacturer. The most prominent North American manufacturers are:

There are five major manufacturers of rotary screw chillers. The equipment they offer uses either HCFC-22 or HFC134a refrigerant, and both air-cooled and water-cooled models are available.

Scores of companies—including these leading manufacturers—produce PV panels, inverters, and system components. For a more complete listing, see Underwriters Laboratories’ “Information for Regulators and Utilities” page and the California Energy Commission’s lists of eligible renewable equipment.

The following is a sampling of companies that offer commercial or very-near-commercial DG products. It is not meant to be a comprehensive list.

The U.S. motor industry is relatively fragmented_roughly 20 manufacturers make most of the integral-horsepower induction motors sold in the U.S., and none of them dominate the market. Many of the selected manufacturers listed here also sell variable-speed motors, which can help to match the motor to variable loads.

Of the dozens of ASD manufacturers, only a handful provide Web resources:

For extensive listings of ASD products and manufacturers, check out the following resources:

These are manufacturers of voltage controllers:

There are far more furnace manufacturers than we can list here. For a thorough list, see the Consumers’ Directory of Certified Efficiency Ratings, published by the Gas Appliance Manufacturers Association. Here are a few industry leaders:

Thirty or more companies manufacture radiant heating equipment. What follows is a short list of a few of the leading suppliers.

A list of Energy Star-certified boilers is available from the Energy Star web site. The following is a partial list of manufacturers of small gas boilers:

A useful online resource to compare general space heater features and performance are consumer opinion web sites such as www.epinions.com. Small portable space heaters are rated on these sites, but there are currently no ratings for unit heaters and radiant panels. You can also compare information on the web sites of space heater manufacturers, including these:

The following is a partial list of manufacturers that offer programmable thermostats.

The following and a number of other companies produce compact fluorescent lamps:

Dozens of firms produce fluorescent ballasts, including the following leading manufacturers. For a more complete listing, visit the Illuminating Engineering Society of North America.

A list of the major fluorescent lamp manufacturers follows.

Several manufacturers offer variations of the new fluorescent fixtures for high-bay applications. Most designs are square or rectangular and are derived from either recessed troffers or surface-mounted fixtures. To facilitate “one-for-one” replacement of existing HID fixtures, the new fluorescent fixtures are usually hung from chains or pendant-mounted from a single point.

The list below presents some of the leading manufacturers of indirect lighting fixtures.

The following is a partial list of manufacturers that offer lighting control products.

Following are some of the largest makers of LEDs:

These companies generally supply LEDs to hundreds of original equipment manufacturers that place them in luminaires and other products sold to end users.

To help you sort through the products in several emerging LED fields, the Energy Star Lighting Program will begin rating products in late 2008.

Following is a partial listing of companies that offer MH lamps and track-lighting fixtures.

Here are some suppliers' Web sites to visit for more information:

The following manufacturers offer personal dimming systems.

Here is a partial list of manufacturers of remote-source lighting products:

Five companies offer products that use occupancy sensors to control plug loads.

There are many TVSS manufacturers. The following is a partial list.

The leading manufacturers of ice-making machinery are listed below.

Only one manufacturer makes vending machine occupancy sensor systems in North America:

Only one company offers an evaporator fan controller:

Designing a DOAS requires applications knowledge so that the system is properly configured and the ventilation-air subsystems are properly sized. A few engineering design firms specialize in the application of DOASs:

The best-known manufacturers that supply dampers, actuators, and controls are:

Here is a partial list of industrial and commercial fan manufacturers.

Listed below are some of the leading manufacturers of underfloor air systems.

Here is a partial list of residential and commercial water heater manufacturers.

Here is a partial list of residential and commercial water heater manufacturers.

Here is a list of manufacturers of heat pump water heaters.

And for consulting on heat pump water heater design:

Here is a partial list of manufacturers of tankless water heaters.