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1. An external-air conditioning apparatus comprising: a heat exchanger that can be incorporated into a heat medium circuit of an air conditioning apparatus and including a heat transfer pipe and a plurality of fins; and a housing, wherein the housing comprises: a base portion in which the heat exchanger is stored and, the base portion having an outlet formed at a predetermined position; a front wall portion disposed opposite of the outlet of the base portion so that the front wall portion faces the base portion, wherein the front wall portion includes a first insulation structure portion; a peripheral wall portion disposed between the front wall portion and the base portion, wherein the peripheral wall portion includes a second insulation structure portion and an inlet capable of introducing external air being formed at a position distant from the outlet; a heat-exchanger-holding structure portion constructed to hold the heat exchanger in a longitudinal direction of one of the plurality of fins of the heat exchanger such that a direction from the inlet toward the outlet substantially coincide with each other and wherein the heat exchanger has predetermined intervals between the heat exchanger and an inner surface of the front wall portion, between the heat exchanger and an inner surface of the base portion, and between the heat exchanger and an inner surface of the peripheral wall portion; and a water receiving portion disposed between the heat exchanger and the inlet, wherein the water receiving portion comprises: a water-receiving support portion disposed at the base portion; a drain pan detachably supported by the water-receiving support portion; a drain passage capable of draining accumulated water that has been accumulated in the drain pan outwardly from the external-air conditioning apparatus; and a first heat insulating material disposed at an outer surface of the drain pan, and wherein the drain pan includes a top and a bottom wherein the top is open towards the heat exchanger and the top faces an open region, wherein the top of the drain pan is equal in width to or is larger in width than an end surface of the heat exchanger faced by the open region, wherein the drain pan is formed so as to gradually become smaller in width from the top of the drain pan to the bottom of the drain pan, wherein the plurality of fins of the heat exchanger is vertically disposed, wherein the water receiving portion is positioned directly below the heat exchanger to collect dew drops formed on and falling from the plurality of fins of the heat exchanger, wherein the water receiving portion is disposed above the inlet, allowing the external air entering the external-air conditioning apparatus through the inlet to pass between the water receiving portion and the front wall portion before flowing upward toward the heat exchanger, such that rain entering the inlet is prevented from directly striking the heat exchanger and instead hits the water receiving portion or the front wall portion.
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