An apparatus and method for testing the efficacy of an insect repellent is disclosed. The apparatus according to one embodiment includes a housing having an aperture extending through a wall of the housing, a carbon dioxide delivery device coupled to the housing through the aperture, a skin substitute substrate, and a heater coupled to the substrate. The method includes the steps of providing a skin substitute substrate, treating the skin substitute substrate with an insect repellent, exposing a plurality of insects to the treated skin substitute substrate for a first period of time, blocking the treated skin substitute substrate from the plurality of insects for a second period of time, and recording the insect repellent's complete protection time.
