Temperature Conversion
Wind Speed Conversion
Relative Humidity Calculation
Dew Point from Relative Humidity
Wet Bulb from Relative Humidity
Psychrometric Calculator
Conversion (All sorts of fun!)
Engineering ToolBox
Pump Affinity Laws
Fan Affinity Laws

Useful Formulas

Chiller Evaporator Flow Formula: GPM = 24*Tons/∆T water
Chiller Condenser Flow Formula: GPM = 30*Tons/∆T water
Cooling Tower Flow Formula: GPM = 30*Tons (chiller)/∆T water
Boiler Flow Rate: GPM = 2*MBH/∆T water
Sensible Heat Calculation (at sea level): SMBH = 1.085 * CFM/1000 * (∆T air)
Total Heat Calculation (at sea level): TMBH = 4.5 * CFM/1000 * (∆h air)
Coil Flow Formula: GPM = 2*MBH/∆T water
Pump Energy: Pump BHP Water = (GPM x Head ft) / (3960 x Pump eff)
Fan Energy: Fan BHP Air = (CFM x Static Press in) / (6356 x Fan eff)
BHP to KW Conversion: KW = HP x .7456

Industry Associations

ACCA-Air Conditioning Contractors of America
AGA-American Gas Association
AGC-The Associated General Contractors of America
AHR- AHR Expo
AIA-American Institute of Architects
ANSI - American National Standards Institute
AHRI - Air-Conditioning, Heating, and Refrigeration Institute
ASHRAE-American Society of Heating, Refrigerating and Air-Conditioning Engineers
ASHRAE Southern Nevada Chapter
ASPE - The American Society of Plumbing Engineers
ASPE Southern Nevada Chapter
BOMA-Building Owners and Managers Association
ETL - Engineering Testing Laboratories
GAMA - Gas Appliance Manufacturers Association
IFMA - International Facility Management Association
MCAA - Mechanical Contractors Association of America
NAIOP - Commercial Real Estate Development Association
SMACNA - Sheet Metal and Air Conditioning Contractors' National Association
UL - Underwriters Laboratories
DOE - United States Department of Energy
USGBC - United States Green Building Council
NFPMA - Nevada Professional Facility Managers Association
CTI - Cooling Technology Institute
AEE - Association of Energy Engineers
IGSHPA - International Ground Source Heat Pump Association
CSI - Construction Specifications Institute
HI - Hydraulic Institute

Regulations and Code Resources

ICBO - International Conference of Building Officials
NFPA - National Fire Protection Association
IFCI - International Fire Code Institute
ICC - International Code Council
IAPMO - International Associates of Plumbers and Mechanical Officials
NCSBCS - National Conference of States Building Codes and Standards

Publications

Air Conditioning, Heating, and Refrigeration News
American School & University
ASHRAE Journal
Building Design & Construction
Buildings Magazine
Consulting-Specifying Engineering Magazine
Contracting Business
Contracting Magazine
Engineered Systems
Facilities Magazine
HPAC Engineering
HPAC Engineering Magazine
HVAC News
HVACR News
Mechanical Engineering Online
Plant Engineering
Plumbing & Mechanical
PM Engineer
School Construction News
Snips