Newsline / News

Psychometric Formula Honored

Willis Carrier
Willis Carrier, Ph.D.

FARMINGTON, Conn. — This past December marked the 100th anniversary of the Rational Psychrometric Formulae, the cornerstone of all fundamental calculations in the air conditioning industry, developed by inventor Willis Carrier, Ph.D., founder of Carrier. Carrier is a part of UTC Climate, Controls & Security Systems, a unit of United Technologies Corp.

Less than a decade after inventing modern air conditioning in 1902, Carrier’s research and development efforts came together in the document, the Rationale Psychrometric Formulae. The document helps determine the precise correlation between temperature and humidity to create a comfortable environment year-round.

According to the company, Carrier presented the psychrometric formulae on Dec. 8, 1911, at the annual meeting of the American Society of Mechanical Engineers and initiated the field of scientific air conditioning design. His invitation to the meeting recognized air conditioning as a formal branch of engineering, and turned 35-year-old Carrier into an internationally recognized leader in the field, said the firm.

“Dr. Carrier’s development of the psychrometric formulae unlocked the potential of air conditioning for the world,” said John Mandyck, chief sustainability officer, UTC Climate, Controls & Security Systems. “From his first installation that marked the birth of modern air conditioning, the psychrometric formulae enabled an entire global industry to flourish by meeting the comfort, productivity, and health needs of people across the world.”

Carrier’s work continues to impact the next generation of engineers, who learn the formulae as part of their coursework. According to Charles Williamson, the Willis H. Carrier Professor at Cornell University’s College of Engineering, Carrier’s work resulted in the acceptance of the “control of air” as a branch of engineering, and paved the way for countless engineers and inventors who followed him.

“Students of engineering today appreciate the tremendous work done by Willis Carrier. Without these early researchers, and the work they did with little or no equipment, we would not have the basis for the sophisticated systems for air conditioning we have today,” Williamson said.

Revered in countless ways around the globe, Carrier has earned special recognition at Cornell University, his alma mater, said the company.

“The Willis H. Carrier Endowed Professorship is a fitting and lasting tribute to the work of a pioneering inventor,” said Lance Collins, dean of Cornell University’s College of Engineering. “We are very pleased that the Carrier name will be associated with Cornell in perpetuity. Endowed professorships support our most esteemed faculty members, so that they can continue to advance their fields of knowledge.”

For more information, visit

Publication date: 01/16/2012

Did you enjoy this article? Click here to subscribe to The NEWS Magazine

You must login or register in order to post a comment.



Image Galleries

2015 HARDI Fly-In

Highlights from HARDI's Congressional Fly-In in Washington, D.C. Post date: May 28, 2015.


NEWSMakers: Kevin Conrad
Kevin Conrad, president, Kevin Conrad Heating and Cooling Inc., Nantucket, Massachusetts, breaks down working in the New England climate, the benefits of insulation foam, and more.

More Podcasts


NEWS 06-29-15 cover

2015 June 29

Check out the weekly edition of The NEWS today!

Table Of Contents Subscribe

Online Reviews

Do you track online review sites like Yelp to look for comments on your company’s performance?
View Results Poll Archive


2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

More Products

Clear Seas Research


Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


Magazine image
Register today for complete access to Get full access to the latest features, Extra Edition, and more.


facebook icontwitter iconyoutube iconLinkedIn i con