Why 21°C is no longer ideal – this temperature saves energy and keeps you comfortable

January 14, 2026

In today’s quest for sustainability and comfort, the idea that a fixed indoor temperature of 21°C is the ideal setting for every household is being challenged. As energy prices continue to rise and climate change becomes an undeniable reality, the standards for thermal comfort are evolving. Many now argue that a slightly cooler environment not only enhances personal comfort but also aligns with sustainable living practices. Research suggests that adjusting thermostats downwards, especially during cooler months, can significantly contribute to energy savings without sacrificing the warmth or solace of home. With the energy efficiency of our living spaces becoming increasingly vital, it’s worth examining how temperature optimization can lead to a healthier indoor climate while also benefiting the planet.

For many, the allure of a warm home during winter months often leads to a reliance on higher thermostat settings, but this perspective is shifting. Lowering the thermostat settings—ideally between 18-20°C—is emerging as a practical recommendation from experts in both energy efficiency and thermal comfort. This adjustment not only aids in reducing monthly utility bills but also promotes a healthier lifestyle. The act of maintaining a cooler home can improve sleep quality, increase calorie burn, and even extend the lifespan of household appliances like refrigerators.

Moreover, adapting our indoor climates can support a sustainable lifestyle by minimizing our environmental footprint. Research shows that such strategic thermal regulation reduces the energy demand, aiding in the overarching fight against climate change. Consider the savings: by lowering the thermostat just a few degrees, households can potentially cut their heating costs by up to 15%, translating to substantial yearly savings. The balance between comfort and energy efficiency is becoming less of a challenge thanks to modern technology like programmable thermostats, which adapt to personal routines and preferences.

Ultimately, the focus on understanding one’s own preferences while embracing the broader implications of our energy consumption equips individuals to make informed choices. As the dialogue continues around optimal indoor temperatures, it remains crucial to acknowledge that the perfect home environment is a synthesis of personal comfort and responsible energy use. By making conscious choices about our heating habits, each household can contribute to a larger movement towards a more sustainable future while enjoying the immediate benefits of a well-regulated indoor climate.