Smart Thermostat vs. Smart Light: Tested, Year-Round Use Case We’ve spent the past year comparing the daily impact of a smart thermostat versus a smart light in our home. While the thermostat consistently saves energy by fine-tuning heating and cooling, the smart light proves indispensable with its adaptive color modes—perfect for mimicking natural daylight in winter or creating cozy ambiance in autumn. What surprised us was how both devices complement each other; the thermostat manages baseline comfort, while the light adjusts human circadian patterns effortlessly. Neither feels redundant, as each serves distinct yetplementary roles in syncing our home with our natural rhythm. For year-round efficiency, we’d recommend pairing them—especially during extreme seasons when subtle adjustments make the biggest difference.