Could sleeping with a fan on cause heart attacks? Understanding the potential heart health dangers

As temperatures climb during hot weather, many people rely on electric fans for an affordable way to stay cool, especially when air conditioning isn’t available. Fans help by circulating air and promoting sweat evaporation, which cools the body. However, recent research reveals that using a fan in certain conditions, particularly in very hot and humid environments, could increase strain on the heart, especially for older adults or those with heart problems. While fans can be beneficial in some climates, they may pose risks in others, making it important to understand when and how to use them safely to protect your health

The surprising effect of fans on heart health in different heat conditions: Hot and humid; hot and dry

According to a study published by the University of Sydney, using a fan combined with skin wetting can reduce the risk of deadly cardiac strain in hot and humid weather. The research, conducted in collaboration with the Montreal Heart Institute, found that this cooling method effectively lowers heart strain in older adults during heatwaves. However, in very hot and dry conditions, fan use without skin wetting can increase cardiac strain, highlighting the importance of adapting cooling strategies to specific environmental conditions.


The researchers tested fan use in two different hot environments: one that was hot and humid, and another that was hot and dry.

Their findings showed that in hot and humid weather, using a fan with or without wetting the skin helps reduce the strain on the heart. This is good news for those living in such climates.

However, the study also found a worrying result for hot and dry conditions. In this environment, fan use actually tripled the increase in cardiac strain. This means the heart works much harder, which could be dangerous or even fatal for people with heart problems.

Why does fan use affect the heart differently in various climates

The difference lies in how fans cool the body. In humid conditions, sweat doesn’t evaporate easily because of the moisture in the air. The fan helps by moving air and promoting evaporation, which cools the skin and reduces heat stress.

In dry conditions, sweat evaporates quickly anyway, so fans mostly just blow hot air over the skin. This can actually force more heat into the body, increasing the heart’s workload and raising the risk of heat-related illness.

Who is most at risk

Older adults and people with pre-existing heart disease are particularly vulnerable to heat stress. The extra strain placed on the heart by extreme temperatures and improper cooling methods can increase the risk of heart attacks or other cardiac events. Dehydration and electrolyte imbalances during heatwaves further exacerbate these risks, making prevention and prompt response vital for safety.

If you or someone you care for falls into this category, it’s important to be extra cautious during heatwaves. Monitor symptoms like dizziness, chest pain, or shortness of breath and seek medical help if needed.

How climate change is impacting heatwave risks

Rising global temperatures mean heatwaves are becoming more frequent, intense, and longer-lasting. This puts more people, especially the elderly and those with health conditions, at greater risk. Public health strategies are evolving to better educate communities on how to stay safe, including understanding which cooling methods are appropriate for different environments.

Tips for using fans safely during hot weather

To maximise the benefits of fans while minimising risk:

• In hot and humid conditions, use a fan along with periodically wetting your skin to enhance cooling.
• Avoid fan use during extreme hot and dry conditions without skin wetting to prevent increased heat strain.
• Ensure fans are placed to provide airflow without blowing directly onto you for long periods, which can cause dehydration.
• Combine fan use with other cooling techniques, such as shade, hydration, and appropriate clothing.

The importance of understanding heatwave safety

With climate change causing more frequent and intense heatwaves, knowing how to protect yourself is more important than ever. This study highlights that simple, everyday tools like fans aren’t always safe in every situation.

By understanding when and how to use cooling methods effectively, you can help reduce the risk of heat-related heart strain and stay safe during hot weather


Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making any changes to your health routine or treatment.




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