An insect trap apparatus includes a trap housing having at least one inlet and at least one outlet. A source of suction is located within the housing and is in fluid communication with the inlet for drawing insects through the inlet. Carbon dioxide gas is disposed in the housing and includes a combustion chamber with a chamber outlet. An exhaust system is connected to the CO2 gas source for directing a flow of CO2 from the gas source to the at least one outlet. Insects are caught in a trap cup that is connected to the housing and disposed between the inlet and the source of suction.