Engineering Professionals, Inc.

Reference

ASHRAE (National or Local)

E-Codes - a great site for code research.

HPAC Magazine - the infodex allows you to search all manufacturers.

Manufacturers - HVAC

Aaon Air Conditioners

Baltimore AirCoil Cooling Towers

Bell & Gossett Pumps, etc.

Carrier Air Conditioning Equipment

Cook Fans

Envirotec Air handlers and VAV boxes

Greenheck Fans & Hoods

Johnson Controls

Marley Cooling Towers

Mason Industries Vibration Isolators

McQuay Air Conditioning Equipment

Metal*Aire Air Devices & VAV boxes

Pittsburg Corning Foamglass insulation

Ruskin Dampers

Spirax-Sarco steam specialties

Taco Pumps, etc.

Titus Air Devices & VAV boxes

Trane Air Conditioning Equipment

York Air Conditioning Equipment

Medical Gas

Amico Corporation