Earth tube heat exchangers (ETHEs) are sustainable systems that use the Earth’s stable temperature to condition incoming ventilation air, providing an energy-efficient solution for indoor climate control. This research project investigates methods to enhance air quality within ETHEs, focusing on the mitigation of potential air quality issues related to moisture and particulate matter. A custom-designed EAHE system was coupled with a dehumidification unit to treat the incoming air before it interacts with the ground heat exchanger. The dehumidifier employed desiccant technology, effectively reducing the moisture content in the incoming air stream. This modification not only enhanced the air's density but also mitigated the risk of condensation within the heat exchanger, which can lead to reduced efficiency and potential system damage. The study explores innovative technique of adding dehumidifier at the inlet to improve the overall indoor air quality and thermal comfort through the utilization of ETHE technology. Using a validated model in SimScale software, we conducted a comparative analysis of heat exchanger efficiency, taking a stepwise approach. The experimental phase of this study involved monitoring comparing with the predesigned model and analyzing the performance of the enhanced ETHE system. Results indicated a significant reduction in moisture levels within the ventilation air, which, in turn, increased the density of the air, and as a result, 3.82% increase in temperature difference was found. Additionally, adding dehumidifier will also help in reduction of corrosion of the system.