In certain embodiments, a system for killing pests in an affected area includes a heat exchanger unit and an electric heater. The heat exchanger unit is placed within the affected area and is coupled to a faucet. The heat exchanger unit is configured to receive a flow of water from the faucet and to emit heated air by transferring heat from the flow of water to air flowing through the heat exchanger unit. The electric heater further heats the air emitted by the heat exchanger unit to a target temperature greater than 120 degrees Fahrenheit.