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Tech Tips:

Something to Watch For When Replacing a Thermostat

Sometimes, you may have to replace a fancy thermostat with a simple one. It may be because the customer got fed up with all the options, or maybe the basic stat is the only thing on your truck. No matter the reason, you need to make sure the new thermostat can do the old one's […]

Coil SHR, Ventilation, and Bypass Factor – Advanced Psychrometrics Part 2

This is the second article in a three-part series where we explore advanced psychrometrics. The source material for each of the articles in this series is ACCA Manual P Sections 3, 4, and 5. This article is based on information found in Section 4. If you followed the previous advanced psychrometrics article, you now know […]

What Willis Understood

I've been reading a book called Cool: How Air Conditioning Changed Everything, and it got me interested once again in the history of air conditioning and refrigeration. Like many things, the people who are credited with “inventing” are the ones dogged enough to make an idea commercially successful, not the idealists forever tucked away in the […]

EcoBee Thermostats and Dehumidification

Dehumidification features have been common on residential systems ever since the introduction of variable speed blower motors. The system is set up so that the blower can produce less CFM per ton when the latent load (humidity) in the space is higher than the setpoint relative humidity. Slowing the blower increases moisture removal by […]

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Podcasts:

An IAQ & Dehum Case Study w/ Genry & Nikki

Nikki Krueger and Genry Garcia return to the podcast to talk about a recent IAQ & dehumidification case study on a vintage home in Miami. The home was very clean but had a musty odor and VOC concerns. You can read the case study in the “Literature” section at https://www.santa-fe-products.com/about-us/media-resources/. Blower door tests and ZPD […]

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How to Evacuate an AC system, Full Vacuum Procedure

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HVAC School – For Techs, By Techs

Real training for HVAC ( Heating, Ventilation, Air Conditioning and Refrigeration) Technicians. Including recorded tech training, interviews, diagnostics and general conversations about the trade.

In this short podcast episode, Bryan explores an interesting story in the history of HVAC: how air conditioning saved the movies.

In the summer of 1925 in NYC, a new film was set to appear on the big screen… but the theater was stuffy with no fan that could cool down the sheer mass of people packed into the room. People were uncomfortable, and theater attendance plummeted in the summer. The movie industry struggled to fill seats in the summer.

Willis Carrier, who had solved humidity problems in factories and printing plants, was called on by the theater owners to cool a 2000-seat auditorium in July. Carrier had used cold water up to that point, but his team installed a refrigeration-based cooling system, and the response was sensational. Theaters were able to sell comfort AND relief all at once, drawing record crowds. What was once the slow season for the movies became the prime time for new film releases; the summer blockbuster was born, and Carrier had changed the movie industry forever.

However, Carrier’s system wasn’t perfect straight out of the gate; orchestra seats near supply vents were very cold, and the balcony was still warm. It became clear that tonnage meant nothing if the air couldn’t move and mix properly. Carrier had to think about air distribution to keep people comfortable and make the invention reach its full potential. Air distribution problems are still common issues we see in homes today; capacity has to work hand in hand with duct design in order to deliver comfort.

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Search Episodes

How Air Conditioning Saved the Movies – Short #262

10/21/2025

Bryan Orr

Just Do it! w/ Chad Simpson

10/16/2025

Bryan Orr