A system, comprising: a gas turbine engine; and an anti-icing heat recovery system, comprising: a first heat exchanger configured to receive a working fluid from an exhaust section of the gas turbine engine and to transfer heat from the working fluid to a cooled intermediate heat transfer medium to generate a heated intermediate heat transfer medium; a second heat exchanger configured to receive the heated intermediate heat transfer medium from the first heat exchanger and to transfer heat from the heated intermediate heat transfer medium to air entering the gas turbine engine; and a variable speed fan configured to urge the working fluid from the exhaust section of the gas turbine engine through the first heat exchanger, characterized by the system further comprising a controller configured to control a fan speed of the variable speed fan based on sensor feedback, wherein the sensor feedback comprises data indicative of an inlet temperature of the air entering the gas turbine engine and an exhaust temperature of the working fluid wherein the controller is configured to reduce the fan speed of the variable speed fan when the exhaust temperature is less than or equal to a threshold acid dew point temperature wherein the controller is configured to increase the fan speed of the variable speed fan when the exhaust temperature is above a threshold acid dew point temperature and the inlet temperature is within an anti-ice temperature range, wherein the controller uses sensor feedback and control signals to control the variable speed fan to heat the air entering the gas turbine engine while simultaneously maintaining the exhaust gas temperature above the acid dew point threshold value. a gas turbine engine; and an anti-icing heat recovery system, comprising: a first heat exchanger configured to receive a working fluid from an exhaust section of the gas turbine engine and to transfer heat from the working fluid to a cooled intermediate heat transfer medium to generate a heated intermediate heat transfer medium; a second heat exchanger configured to receive the heated intermediate heat transfer medium from the first heat exchanger and to transfer heat from the heated intermediate heat transfer medium to air entering the gas turbine engine; and a variable speed fan configured to urge the working fluid from the exhaust section of the gas turbine engine through the first heat exchanger, characterized by the system further comprising a controller configured to control a fan speed of the variable speed fan based on sensor feedback, wherein the sensor feedback comprises data indicative of an inlet temperature of the air entering the gas turbine engine and an exhaust temperature of the working fluid wherein the controller is configured to reduce the fan speed of the variable speed fan when the exhaust temperature is less than or equal to a threshold acid dew point temperature wherein the controller is configured to increase the fan speed of the variable speed fan when the exhaust temperature is above a threshold acid dew point temperature and the inlet temperature is within an anti-ice temperature range, wherein the controller uses sensor feedback and control signals to control the variable speed fan to heat the air entering the gas turbine engine while simultaneously maintaining the exhaust gas temperature above the acid dew point threshold value. a first heat exchanger configured to receive a working fluid from an exhaust section of the gas turbine engine and to transfer heat from the working fluid to a cooled intermediate heat transfer medium to generate a heated intermediate heat transfer medium; a second heat exchanger configured to receive the heated intermediate heat transfer medium from the first heat exchanger and to transfer heat from the heated intermediate heat transfer medium to air entering the gas turbine engine; and a variable speed fan configured to urge the working fluid from the exhaust section of the gas turbine engine through the first heat exchanger, characterized by the system further comprising a controller configured to control a fan speed of the variable speed fan based on sensor feedback, wherein the sensor feedback comprises data indicative of an inlet temperature of the air entering the gas turbine engine and an exhaust temperature of the working fluid wherein the controller is configured to reduce the fan speed of the variable speed fan when the exhaust temperature is less than or equal to a threshold acid dew point temperature wherein the controller is configured to increase the fan speed of the variable speed fan when the exhaust temperature is above a threshold acid dew point temperature and the inlet temperature is within an anti-ice temperature range, wherein the controller uses sensor feedback and control signals to control the variable speed fan to heat the air entering the gas turbine engine while simultaneously maintaining the exhaust gas temperature above the acid dew point threshold value.