Two portable cabins (size 2 m width, 2 m depth, 2.8 m height) were constructed using 75 mm Polyurethane sandwich panels (insulation walls) to simulate low energy buildings in Kuwait. Experimental measurements were conducted using eight K-type thermocouple probes on interior/exterior surfaces of the cabins’ walls to dynamically evaluate overall heat transfer coefficient during the hot months of August and September 2023 using IoT data storage. The collected data was further curated to ensure quality by treating negative values, handling potential division by zero issues, and filtering out large numbers. The dynamic average overall heat transfer coefficients were found to be 0.186, 0.198, 0.203, and 0.206 W/m2K for the East, North, West, and South facing walls, respectively. This is far better than the static (steady state) overall heat transfer coefficient of 0.2534 W/m2K, indicating that the dynamic behavior of the insulation walls is very promising, particularly by saving 21.76% cooling energy demands in summertime in Kuwait.