A heat extraction system (200, 300) for an enclosure receiving at least one computer having a computer fan, the heat extraction system (200, 300) comprising: - at least one heat pipe (238, 338) having an evaporating reference temperature and a condensing reference temperature lower than the evaporating reference temperature, the at least one heat pipe (238, 338) being arranged with respect to the enclosure so as to transfer thermal energy from the enclosure to a surrounding environment of the enclosure when: - an interior temperature of the enclosure is greater than the evaporating reference temperature, and - a temperature of the surrounding environment is less than the condensing reference temperature; - an evaporator portion (240, 340); - a condenser portion (242, 342); - a support frame (236, 336) adapted for connection to the enclosure, the support frame (236, 336) being arranged with respect to the at least one heat pipe (238, 338), such that, when the support frame (236, 336) is connected to the enclosure: - the evaporator portion (240, 340) is thermally coupled to the at least one computer via convection, and - the condenser portion (242, 342) is thermally coupled to the surrounding environment via convection; and - a control unit adapted for receiving a signal indicative of the interior temperature of the enclosure; and - an internal fan disposed proximate the evaporator portion (240, 340), arranged with respect to the at least one computer to aspire a heated air flow away from the at least one computer, and electronically connected to the control unit, the control unit selectively causing the internal fan to direct an internal air flow toward the evaporator portion (240, 340) when the interior temperature of the enclosure is at a critical interior temperature greater than a high operating temperature; characterized in that: - the control unit is adapted to be electronically connected to the computer fan for selectively causing the computer fan to direct at least a portion of the heated air flow aspired by the internal fan away from the at least one computer. - at least one heat pipe (238, 338) having an evaporating reference temperature and a condensing reference temperature lower than the evaporating reference temperature, the at least one heat pipe (238, 338) being arranged with respect to the enclosure so as to transfer thermal energy from the enclosure to a surrounding environment of the enclosure when: - an interior temperature of the enclosure is greater than the evaporating reference temperature, and - a temperature of the surrounding environment is less than the condensing reference temperature; - an interior temperature of the enclosure is greater than the evaporating reference temperature, and - a temperature of the surrounding environment is less than the condensing reference temperature; - an evaporator portion (240, 340); - a condenser portion (242, 342); - a support frame (236, 336) adapted for connection to the enclosure, the support frame (236, 336) being arranged with respect to the at least one heat pipe (238, 338), such that, when the support frame (236, 336) is connected to the enclosure: - the evaporator portion (240, 340) is thermally coupled to the at least one computer via convection, and - the condenser portion (242, 342) is thermally coupled to the surrounding environment via convection; and - the evaporator portion (240, 340) is thermally coupled to the at least one computer via convection, and - the condenser portion (242, 342) is thermally coupled to the surrounding environment via convection; and - a control unit adapted for receiving a signal indicative of the interior temperature of the enclosure; and - an internal fan disposed proximate the evaporator portion (240, 340), arranged with respect to the at least one computer to aspire a heated air flow away from the at least one computer, and electronically connected to the control unit, the control unit selectively causing the internal fan to direct an internal air flow toward the evaporator portion (240, 340) when the interior temperature of the enclosure is at a critical interior temperature greater than a high operating temperature; characterized in that: - the control unit is adapted to be electronically connected to the computer fan for selectively causing the computer fan to direct at least a portion of the heated air flow aspired by the internal fan away from the at least one computer. - the control unit is adapted to be electronically connected to the computer fan for selectively causing the computer fan to direct at least a portion of the heated air flow aspired by the internal fan away from the at least one computer.