A system for killing pests in an affected area of a structure comprises a heat pump unit placed within an affected area. The heat pump unit comprises an evaporator component, a condensor component, and a compressor component. The evaporator component is configured to receive a flow of water from a faucet, and transfer heat from the flow of water to a refrigerant. The condenser component is configured to receive the refrigerant from the evaporator component, and generate heated air by transferring heat from the refrigerant to air flowing through the condenser component. The heated air being emitted into the affected area is in order to raise the temperature of the affected area to a target temperature greater than 120 degrees Fahrenheit. The compressor component is configured to return the refrigerant from the evaporator component of the heat pump unit to the condenser component of the heat pump unit.