The aim of this research is to evaluate the operation of ceiling-based distribution (CBAD) systems and underfloor air-distribution (UFAD) systems and determine their effect on thermal comfort based on ceiling height. This research will help in understanding how the type of air conditioning system affects thermal comfort. The data, which are thermal comfort values, collected using a simulation program called FloVENT. Other tools such as predicted mean vote PMV tool and predicted percentage of dissatisfied PPD tool are used to collect the data. The main expected result of this research is that CBAD and UFAD systems improve thermal comfort of a building and lower its energy consumption. The findings from this research can be used by designers, engineers, manufacturers, contractors and home owners to design, develop and select the most appropriate heating and air-conditioning system to satisfy occupants throughout a building’s lifecycle. This not only benefits home developers, owners, and occupants but also contributes positively to the environment by saving energy and reducing the carbon footprint of housing.