The Thermostat Effect: What Emotional Intelligence Really Asks of Leaders
There is a distinction that has stayed with me for years, borrowed from psychology and used often enough in leadership circles that it has become something of a cliché, though I think the cliché earns its place. Some people lead like thermometers. Some lead like thermostats.
A thermometer reads the temperature of whatever room it is in and reports it back faithfully. When the tension climbs, the reading climbs.
A thermostat reads the room too, but it does something more than report. It holds a set point, and the room eventually comes around to meet it.
Most of us lead like thermometers more often than we would choose to if we were asked directly. A sharp email lands and the jaw tightens before the second sentence. A colleague arrives at a meeting rattled and within minutes the whole table has picked it up without anyone naming what happened. This is not a personal failing. It is simply how emotion travels through groups of people, and leaders sit closer to the source of that weather than almost anyone else in the building.
What tends to separate a leader who is merely present in the room from one who genuinely steadies it is not the absence of feeling. Steady leaders feel the tension too. What differs is the size of the gap they can hold between the feeling arriving and the response leaving their mouth, and what they do with that gap once they notice it.
Why this is a skill, not a personality trait
Daniel Goleman's original framing of emotional intelligence puts two capabilities ahead of everything else:
Self-awareness, which is simply noticing what you are feeling before it leaks into your tone or your decisions
Self-management, which is what happens in the space after that noticing.
This distinction matters because it means regulation is trainable. It is not a fixed temperament some leaders were born with and others were not. It is closer to a practiced pause, one that gets easier to find the more often it is practised under real pressure rather than in a quiet moment when nothing is actually at stake.
A 2025 review in the Human Resource Development Review pulled together 101 empirical studies spanning three decades, all examining the relationship between a leader's emotional intelligence and their outcomes as a leader. The pattern across that body of work was consistent: leaders with higher emotional intelligence tended to lead in more relational ways, reported stronger wellbeing themselves, and performed better against the tasks in front of them. The review's authors were careful to flag that this is correlation rather than proven cause, which is a fair and necessary caveat, but the consistency across a hundred-plus studies is difficult to wave away.
A separate study published in 2023 looked at something more specific: adaptability, or a leader's capacity to change course cleanly when the situation shifts underneath them. The researchers found that emotional intelligence did not simply sit next to a leader's reasoning ability as a nice-to-have. It amplified it. Leaders with stronger emotional intelligence got more practical benefit from their own reasoning when the path forward was genuinely unclear, compared with leaders whose reasoning scores were similar but whose emotional intelligence was lower. In other words, being sharp is not enough on its own when the ground is moving. What you do with the feelings that come with that movement changes how well the sharpness gets used.
The gap is the point
None of this is a case for suppressing emotion or performing some kind of calm you do not in fact feel. Leaders who bottle everything tend to spill over eventually (usually onto whoever is closest and least deserving of it). The gap between feeling and response is not about erasing the feeling. It is about noticing it early enough that the response which follows is chosen, rather than simply the first thing that arrived.
If your team seems to run hot whenever you do, or goes quiet whenever you're distracted, there is a reasonable chance they are taking their cues from you more directly than you realise. That is not a criticism. It is simply what happens in rooms with a temperature-setter in them, whether or not that person has decided to play the role on purpose.
The invitation this week, for anyone who leads a team, a room, or even just themselves through a difficult conversation, is to notice the first physical sign that a feeling has arrived before it has fully formed into words. A tightened jaw. A held breath. Then to have the patience to pause there for a breath or two longer than feels natural, and ask what response the calmer version of yourself, two degrees further from the reaction, would actually choose.
It will not work every time. But the gap gets a little wider each time you find it, and a wider gap is, in the end, most of what emotional intelligence in leadership turns out to be.
