The global demand for energy consumption is rising at an alarming rate. This increase is driven by economic growth, population expansion, and escalating temperatures due to climate change. Cooling energy demand is projected to rise by 275% globally by 2050, with the Middle East and North Africa (MENA) region being one of the most affected. In Kuwait, buildings account for approximately 90% of electricity consumption, and air conditioning alone constitutes over 70% of this usage during peak summer months. Kuwait’s electricity demand is expected to reach 30,000 MW by 2030, primarily driven by cooling needs. With a population reliant on fossil fuel-based energy, there is an urgent need to find sustainable solutions that can mitigate this rising demand. This paper investigates the use of phase change materials (PCMs) to improve thermal comfort. Two portable cabins were constructed in Kuwait, one equipped with PCMs and the other serving as a control. The study evaluates the combined impact of PCM integration on perceived indoor thermal index, humidity, and air quality during the month of March 2023. Results show that PCM application reduced indoor temperature peaks by 3.31°C on average and stabilized humidity fluctuations by 10%. Moreover, daily particulate matter (PM 2.5) concentrations were reduced by 6.12 µg/m³, indicating an improvement in air quality. These findings suggest that PCMs offer a promising passive cooling solution that can enhance thermal comfort, improve indoor air quality, and the potential to reduce energy consumption in hot climates like Kuwait.