Abstract Understanding plant responses to climate variables such as heatwaves is crucial for plant biology research, necessitating growth environments that are highly controllable and reproducible. Traditional field methods lack control due to absent cooling systems and struggle to isolate field variables. Standard enclosures similarly fail to account for authentic environmental dynamics. To overcome these limitations, we developed AmbControl, a sunlit facility that bridges controlled environments with field conditions. AmbControl accurately captured the 2021 and 2022 heatwave fluctuations, allowing for the simulation of varying heat scenarios, including temperature scenarios ranging from +1.5°C to -4°C, and a stable 28.9°C. We observed differential temperature controls during night and day in the +1.5°C scenario, registering variations of ?1.0°C at night and ?1.8°C during the day. Temperature manipulations also inevitably altered relative humidity, highlighting its role as a confounding factor. The AmbControl system is essential for advanced climate impact studies, offering a platform for the next generation of agronomic experiments and climate resilience research.