To explore the thermoregulation capability of the ASPIRE device, we theoretically analyze its ability to control the radiative heat exchange using the experimentally measured emissivity (Fig. ), as shown in Fig. ). Initially, when the ambient temperature is high, the ASPIRE ℎ = 3 𝑊/𝑚 2 𝐾 device remains at the high-state to release as much heat as possible. Once the ambient ε temperature drops to the midpoint of the desired internal temperature range -i.e., switching temperature ( ) -the device switches to the low-state to minimize the heat loss and maintain 𝑇 𝑠𝑤𝑡 ε temperature. As the ambient temperature cools down further, the device eventually leaves the tunable range and follows the environment downward. When the ambient temperature rises again, the device returns to the high-state, enhancing heat dissipation. As a result, the ASPIRE ε device extends the operating temperature range by 4.2 ℃, as shown by comparing (dark ∆𝑇 1 blue region in Fig. , with emissivity tunability) and