A method for killing pests in an affected area of a structure, comprises positioning a heat exchanger unit within an affected area, coupling a first end of an inlet hose to a faucet, and coupling a second end of the inlet hose to an inlet port of the heat exchanger unit such that the heat exchanger unit may receive a flow of water from the faucet. The heat exchanger unit generates heated air by transferring heat from the flow of water received from the faucet to air flowing through the heat exchanger unit. The method continues by positioning an electric heater proximate to the heat exchanger unit, the electric heater operable to further heat the heated air emitted by the heat exchanger unit to a target temperature greater than 120 degrees Fahrenheit, the further heated air being emitted into the affected area.
