The Hidden Cost of Heat

The hidden cost of heat

March 30, 2026
By Kyle Lewandowski | A decade in safety

For many organizations today, heat is still treated like a seasonal inconvenience. It’s thought of as something to work around, not something that needs to be planned for. If operations slow down on hot days, that’s just part of summer. If people look tired, that’s just the weather. Whatever they see, it’s not risk.

But regulators, insurers, and economists see heat differently. More and more, heat is being considered a predictable hazard with financial consequences long before it becomes a medical emergency.

Growing numbers of state-specific heat illness prevention standards have made that reality hard to ignore. What’s even harder to ignore? The costs that come with being out of compliance.

The economist's take

Heat is quiet. It shows itself only when workers move a bit slower. People’s attention spans shrink, and they make more mistakes. You can practically see the sluggishness spread across a crew.

Your work is going to feel that slow down. Research shows that as temperatures rise, productivity goes down. Studies estimate that for every degree above 75°F productivity drops by roughly 1.5%. That means if it’s 82°, your team is going to be about 10% less efficient.

At higher temperatures and humidity, productivity falls even more dramatically, but oftentimes nothing happens that leads to a reportable incident. These productivity losses don’t appear on injury logs but instead show up as missed deadlines, higher labor costs, and decreases in worker morale.

Here’s the part that economists want us to pay attention to. In the U.S., heat‑related productivity losses are estimated to cost the economy nearly $100 billion per year. Thinking of it on that scale helps explain why enforcement is rising, and why heat is increasingly being viewed as a business issue, not just a safety risk.

Six figures for one event?

When heat does lead to a medical event, that’s when the financial impact really becomes visible. Using OSHA’s Safety Pays estimator, you can plug in your numbers to see what an event could cost. If you use their presets, a single heat‑related illness can cost an employer around $80K once you add up medical treatment, workers’ compensation, and lost time/productivity.

What’s surprisingly NOT in that estimate is any overtime that’s needed to cover the injured worker’s shifts. This also doesn’t include the work of reshuffling the schedule. And it goes without saying that the project will be delayed unless you hire temporary labor.

Most concerning? That $80K estimate doesn’t include legal or regulatory exposure. When you add everything up, one event can quickly cost over six figures.

Said another way: Heat‑related downtime is operational expense.

The invisible multiplier

Heat‑related downtime rarely affects just one person. The downstream effects of an event often ripple through an operation for days or even weeks. Even relatively mild heat illnesses frequently involve days away from work, which forces crews to rebalance workloads or slow production.

When an employee faces heat exhaustion or heat stress:

Work pauses while coworkers respond
Supervisors divert attention from operations
Crews operate short‑handed and/or at a reduced pace

These disruptions can compound quickly in environments with tight margins and fixed deadlines. And unlike equipment failures (which are often a single instance), heat‑related slowdowns often repeat for multiple days during hot stretches.

Insurance costs don't stay flat

Heat‑related incidents can quietly raise insurance costs for years. Workers’ compensation premiums are influenced by a company’s Experience Modification Rate (EMR), which compares its injury costs to others in the same industry. Because EMR is calculated using multiple years of claims data, even a small number of preventable heat‑related incidents can have a lasting financial effect.

Heat matters because it drives both claim frequency and severity. We think of heat as just a number on a thermometer, but it contributes to injuries by impairing focus, reaction time, and judgment. From an insurer’s perspective, that means there’s elevated risk.

Once premiums increase, they rarely come down quickly. And as insurers increasingly factor heat exposure into their risk models, preventing heat illness becomes a practical way to keep insurance costs stable.

Citations don't require an injury

One of the most common misconceptions about heat regulation is that enforcement follows an incident. In reality, citations are often issued based on preparedness, not outcomes.

In December 2024, Cal/OSHA issued more than $276,000 in penalties in a single enforcement action tied to heat violations. They cited failures to provide water, shade, training, and written procedures. This was done even though there wasn’t a catastrophic injury.

The message is clear: Waiting for an incident is not an acceptable strategy.

Beyond fines, heat‑related citations can create broader legal exposure. OSHA and Cal/OSHA citations are frequently used as evidence in workers’ compensation disputes, to support negligence claims, and as triggers for follow‑up inspections or repeat violations. In effect, a missing plan or training record today can become costly documentation tomorrow.

Why is heat getting more attention?

Heat isn’t new. It’s been slowing down workers ever since work become a thing. So, what’s changing? The answer is layered. First, true heat is happening earlier and longer each year.

Second, regulators are changing a few things. More inspections are proactive instead of reactive. And indoor workspaces are being seen as heat risks.

Finally, economic losses are becoming common knowledge. OSHA reports thousands of heat‑related injuries annually, with experts widely acknowledging that these figures are undercounts. As a result, heat has moved from a seasonal concern to a recognized operational risk.

The takeaway

Heat illness prevention is often framed as a regulatory burden. Financially, it works more like insurance.

The right preventions help you maintain productivity on hot days, avoid downtime, reduce the risk of a citation, and increase worker morale. This matters because a lone heat illness can cost more than most people expect. So much so that the final figure often dwarfs the cost of prevention.

Regulators have taken note. OSHA inspections tied to heat are increasing, states are tightening standards, and enforcement is happening earlier in the season. The new goal is to predict and prevent heat illness.

As an industry, we need to move beyond talking about worst‑case scenarios. This is about protecting people and output. Doing both of those means you’ll avoid downtime and keep your insurance costs steady.

Think of it this way, the least expensive heat incident is the one that never happens.