There is provided an indoor unit of an air conditioner to suppress the decrease in the amount of heat exchange between a refrigerant and air due to pressure loss. In the indoor unit of the air conditioner, a second heat exchange part has a high wind velocity region where a wind velocity of air passing through the second heat exchange part is relatively high and a low wind velocity region where the wind velocity of air is relatively low, and the high wind velocity region is located above the low wind velocity region in a direction of gravity. At least one first heat transfer tube is disposed in the high wind velocity region, and at least one second heat transfer tube is disposed in the low wind velocity region. A first header is connected to each of the first heat transfer tube and the second heat transfer tube. The first header has a first internal space to which the first heat transfer tube and the second heat transfer tube are commonly connected. When using a heat exchanger as a condenser, the refrigerant flowed out from a first heat exchange part 110 flows into the first internal space of the first header, and then, the refrigerant flows into each of the first heat transfer tube and the second heat transfer tube from the first internal space.

An air-conditioner for performing a heating operation includes an indoor unit with an indoor heat exchanger set in an air-conditioning target space. There is an outdoor unit set outside the air-conditioning target space, the outdoor unit including a compressor, an outdoor heat exchanger, and an outdoor fan to supply outdoor air to the outdoor heat exchanger. Additionally, there is a humidifier to heat and evaporate condensed water in the outdoor unit to send the evaporated water into the indoor unit. The humidifier includes a water reservoir to store the condensed water in the outdoor unit, and a heating portion formed by a discharge pipe in which the refrigerant discharged from the compressor flows. The discharge pipe communicates between the compressor and the indoor heat exchanger in the heating operation, and the heating portion heats and evaporated the condensed water stored in the water reservoir with heat of the refrigerant.

An air-conditioner for performing a heating operation includes an indoor unit with an indoor heat exchanger set in an air-conditioning target space. There is an outdoor unit set outside the air-conditioning target space, the outdoor unit including a compressor, an outdoor heat exchanger, and an outdoor fan to supply outdoor air to the outdoor heat exchanger. Additionally, there is a humidifier to heat and evaporate condensed water in the outdoor unit to send the evaporated water into the indoor unit. The humidifier includes a water reservoir to store the condensed water in the outdoor unit, and a heating portion formed by a discharge pipe in which the refrigerant discharged from the compressor flows. The discharge pipe communicates between the compressor and the indoor heat exchanger in the heating operation, and the heating portion heats and evaporated the condensed water stored in the water reservoir with heat of the refrigerant.

A make-up air heating system includes an enclosure defining an inlet chamber and an outlet chamber. A heating source is positioned within the inlet chamber and a blower is positioned within the outlet chamber. A motor assembly positioned within the enclosure includes a motor enclosure and a motor. The motor is coupled to the blower.

A make-up air heating system includes an enclosure defining an inlet chamber and an outlet chamber. A heating source is positioned within the inlet chamber and a blower is positioned within the outlet chamber. A motor assembly positioned within the enclosure includes a motor enclosure and a motor. The motor is coupled to the blower.

Disclosed are a gas furnace and an air conditioner having the same. The gas furnace includes: a fuel valve; a manifold providing a passage of fuel passing through the fuel valve; a plurality of burners provided to burn fuel provided from the manifold and spaced apart from each other in one direction; a plurality of heat exchangers providing a passage of combustion gas generated by the plurality of burners; and a blower for causing a flow of air passing around the heat exchanger. The manifold includes: a first tube having one end connected to the fuel valve and forming a first passage; a second tube extending in the one direction, forming a second passage, and facing at least one of the plurality of burners; a third tube extending in the one direction, forming a third passage, and facing remaining burners of the plurality of burners; and a three-way valve connected to the first tube, the second tube, and the third tube.

Disclosed are a gas furnace and an air conditioner having the same. The gas furnace includes: a fuel valve; a manifold providing a passage of fuel passing through the fuel valve; a plurality of burners provided to burn fuel provided from the manifold and spaced apart from each other in one direction; a plurality of heat exchangers providing a passage of combustion gas generated by the plurality of burners; and a blower for causing a flow of air passing around the heat exchanger. The manifold includes: a first tube having one end connected to the fuel valve and forming a first passage; a second tube extending in the one direction, forming a second passage, and facing at least one of the plurality of burners; a third tube extending in the one direction, forming a third passage, and facing remaining burners of the plurality of burners; and a three-way valve connected to the first tube, the second tube, and the third tube.

An air ventilation system for an indoor space includes an air processing unit that includes a housing that receives air from the indoor space and discharges treated air, a microbial deactivation channel provided within the housing and defining a serpentine pathway that causes the air to navigate one or more directional changes as it circulates through the housing, and one or more ultraviolet (UV) light sources arranged within the microbial deactivation channel to emit UV light that impinges on and disinfects the air. One or more light reflection features are provided on one or more interior surfaces of the microbial deactivation channel, the one or more light reflection features comprising flat, mirror-like structures that receive and redirect the UV light within the microbial deactivation channel.

An air ventilation system for an indoor space includes an air processing unit that includes a housing that receives air from the indoor space and discharges treated air, a microbial deactivation channel provided within the housing and defining a serpentine pathway that causes the air to navigate one or more directional changes as it circulates through the housing, and one or more ultraviolet (UV) light sources arranged within the microbial deactivation channel to emit UV light that impinges on and disinfects the air. One or more light reflection features are provided on one or more interior surfaces of the microbial deactivation channel, the one or more light reflection features comprising flat, mirror-like structures that receive and redirect the UV light within the microbial deactivation channel.