Q2 2026 | The Conduit: Connected Solutions for a Better Built Environment 

Humidity in the Desert: The Invisible Load

It’s 2:00 PM.

The operating room is being prepped for the next surgery.

Space temperature is exactly where it should be.

But something feels… off.



That’s how this real-world scenario started. A critical environment, becoming more critical.


At a newly opened healthcare facility in Albuquerque, that “off” feeling turned into something much bigger and in a critical environment.


Visible condensate forming in the supply air — blowing out of diffusers and toward operating tables.


Three ORs had to be shut down.


We went into the space overnight to recreate the issue and were able to replicate the conditions. 


The system wasn’t failing. 

It was operating within its defined limits. But those limits allowed conditions that led to visible condensation. 




Test Your Knowledge

What do YOU think

caused the issue?

(Enter your Guess and Keep reading for clues)

Wait…Humidity in the Desert? 

We hear this across Phoenix, Tucson, Albuquerque, and El Paso: 

“Humidity isn’t really something we deal with here.” 


In desert climates, the humidity story isn’t always about too much moisture — it’s about maintaining stable conditions despite extreme outdoor changes. And sometimes, the biggest issue is the one you don’t see until it's raining down on an OR table or comfort calls are increasing.


Despite the dry reputation of the desert, the reality is dry climate ≠ dry air inside your system. Ventilation air still introduces moisture load and systems often operate near saturation without visibility 

Common Pitfalls We See in the Southwest

Even when everything looks “within spec,” these show up again and again: 




High RH limits

Acceptable on paper, risky in operation 



No dew point visibility 

Can’t see when you’re approaching condensation 



Ventilation air treated as neutral

Hidden latent load 

Controls Clues

What to Watch For 

Magnifying-Glass-Icon-PNG-HD-Quality image
  • Supply air RH trending above ~85% 
  • No alarms until failure 
  • Flat RH trends near limits 
  • No dew point visibility 



But here’s what makes these issues harder to catch:

Many systems aren’t failing because of one obvious mistake. They’re operating exactly as designed…just not as expected.

What's Really Happening

In real buildings, performance isn’t driven by sequences alone.

It’s shaped by things that don’t always show up in a spec:

How quickly systems respond to changing conditions

What assumptions were made about moisture load

How much control exists once the building is occupied

And often…

➔ Sequences don’t match equipment capability

➔ The system physically can’t do what it’s being asked

➔ Controls are left trying to “make it work” with limited sensors and hardware


When those pieces don’t align, you don’t get alarms.

You get drift.

You get edge conditions.

You get systems that look “fine”… until they aren’t.

In the next issue, we’ll break down where these design assumptions start and how they quietly shape everything that follows.

Tackling Moisture in Every Role

Building Performance

How does humidity affect your building and employee productivity 

Design & Engineering

Understand moisture load and system limits in Psychrometrics Part 2!

Installation & Service

Early Warning Signs of Humidity Issues in Commercial Buildings

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