An engine compartment, comprising: an inlet, the engine compartment fluidly connected to an environment through the inlet; an outlet; and an engine assembly disposed inside the engine compartment, the engine assembly comprising: an internal combustion engine received in an interior of the engine compartment; a heat exchanger having a first conduit fluidly connected to a fluid circuitry of the internal combustion engine and a second conduit fluidly connecting the interior of the engine compartment to an environment outside the compartment, the first conduit being in heat exchange relationship with the second conduit; a forced air system comprising a fan operable in use to expel air from the interior of the engine compartment towards the environment so as to provide an air flow from the environment to the outlet via the second conduit of the heat exchanger and the engine compartment; a selector valve configurable to selectively fluidly connect an air intake of the internal combustion engine with the interior of the engine compartment in a first valve position and with the environment in a second valve position; and an intake plenum in fluid communication with the air intake of the internal combustion engine; a first assembly inlet in fluid communication with the interior of the engine compartment; and a second assembly inlet in direct fluid communication with the environment, the selector valve selectively fluidly connecting the intake plenum with the first inlet in the first valve position and with the second inlet in the second valve position. an inlet, the engine compartment fluidly connected to an environment through the inlet; an outlet; and an engine assembly disposed inside the engine compartment, the engine assembly comprising: an internal combustion engine received in an interior of the engine compartment; a heat exchanger having a first conduit fluidly connected to a fluid circuitry of the internal combustion engine and a second conduit fluidly connecting the interior of the engine compartment to an environment outside the compartment, the first conduit being in heat exchange relationship with the second conduit; a forced air system comprising a fan operable in use to expel air from the interior of the engine compartment towards the environment so as to provide an air flow from the environment to the outlet via the second conduit of the heat exchanger and the engine compartment; a selector valve configurable to selectively fluidly connect an air intake of the internal combustion engine with the interior of the engine compartment in a first valve position and with the environment in a second valve position; and an intake plenum in fluid communication with the air intake of the internal combustion engine; a first assembly inlet in fluid communication with the interior of the engine compartment; and a second assembly inlet in direct fluid communication with the environment, the selector valve selectively fluidly connecting the intake plenum with the first inlet in the first valve position and with the second inlet in the second valve position. an internal combustion engine received in an interior of the engine compartment; a heat exchanger having a first conduit fluidly connected to a fluid circuitry of the internal combustion engine and a second conduit fluidly connecting the interior of the engine compartment to an environment outside the compartment, the first conduit being in heat exchange relationship with the second conduit; a forced air system comprising a fan operable in use to expel air from the interior of the engine compartment towards the environment so as to provide an air flow from the environment to the outlet via the second conduit of the heat exchanger and the engine compartment; a selector valve configurable to selectively fluidly connect an air intake of the internal combustion engine with the interior of the engine compartment in a first valve position and with the environment in a second valve position; and an intake plenum in fluid communication with the air intake of the internal combustion engine; a first assembly inlet in fluid communication with the interior of the engine compartment; and a second assembly inlet in direct fluid communication with the environment, the selector valve selectively fluidly connecting the intake plenum with the first inlet in the first valve position and with the second inlet in the second valve position.