Is “Cooling Off With AC Is Enough” Really True? What Recent Insights Teach Us About Getting Used to Full Summer Heat and Managing Your Condition

With the sweltering heat continuing day after day, many people are likely spending more time in air-conditioned rooms. Around the theme of “heat acclimatization” (getting the body used to heat) — a concept also promoted by Japan's Ministry of Health, Labour and Welfare and the Japan Meteorological Agency — a thermal-therapy facility drew attention by running a local awareness campaign. Prompted by this initiative, here are some summer conditioning hints useful for midlife readers and beyond.

What Simply ‘Cooling Off’ Can Miss

• Spending long stretches of time in air-conditioned rooms reduces opportunities to sweat, which can make it harder for the body to get used to heat, the explainer notes. The body's ability to regulate temperature through sweating may function less well if it isn't used regularly, it explains.
• For older adults or those with less physical stamina, using exercise to acclimate to heat can be a significant burden, the explainer points out. In response, gentler ways of warming the body are introduced as an alternative.
• Overcooling from air conditioning is noted as something that can itself become a cause of feeling unwell. Rather than “cooling off” alone, taking time to gently warm the body is introduced as another option for summer conditioning.

What We, in Midlife, Should Keep in Mind Day to Day

This initiative doesn't suggest avoiding air conditioning altogether — it's about balancing cooling with gently acclimating the body to heat. The following commonly recommended habits may offer a starting point for managing your condition this summer.

• Avoid setting the air conditioner too cold, and be mindful of not creating too large a gap with the outdoor temperature
• Choose cooler times of day for light activity, such as walking, within a comfortable range
• Gradually build in opportunities to sweat, such as soaking in a bath

* The above are commonly recommended lifestyle habits and do not guarantee improvement of any specific condition or prevention of heat stroke. If you're concerned about your condition, please consult a medical institution rather than pushing yourself.

Last updated: July 14, 2026