A heating, ventilation, and/or air conditioning (HVAC) unit includes an HVAC unit enclosure having a base pan. The base pan is sloped from an inner portion of the enclosure to an outer lateral edge of the base pan such that the base pan is configured to direct flow of liquid toward and over the outer lateral edge to flow off the base pan.

A heating, ventilation, and/or air conditioning (HVAC) unit includes an HVAC unit enclosure having a base pan. The base pan is sloped from an inner portion of the enclosure to an outer lateral edge of the base pan such that the base pan is configured to direct flow of liquid toward and over the outer lateral edge to flow off the base pan.

An HVAC air flow mixing system includes a reclaimed air loop having a duct tee configured to fluidly intersect an HVAC duct downstream of an indoor heat exchanger and a pipe in fluid communication with the duct tee and configured to fluidly communicate with the indoor unit so as to selectively reintroduce a portion of the discharged air back to the indoor unit upstream of the indoor heat exchanger.

An HVAC air flow mixing system includes a reclaimed air loop having a duct tee configured to fluidly intersect an HVAC duct downstream of an indoor heat exchanger and a pipe in fluid communication with the duct tee and configured to fluidly communicate with the indoor unit so as to selectively reintroduce a portion of the discharged air back to the indoor unit upstream of the indoor heat exchanger.

A condensing heat exchanger system includes a first tube configured to receive a conditioning fluid, a second tube configured to receive the conditioning fluid from the first tube, a first vestibule panel coupled to the first tube, a second vestibule panel coupled to the second tube, and a drain trap assembly directly coupled to the second vestibule panel and configured to collect condensate.

A condensing heat exchanger system includes a first tube configured to receive a conditioning fluid, a second tube configured to receive the conditioning fluid from the first tube, a first vestibule panel coupled to the first tube, a second vestibule panel coupled to the second tube, and a drain trap assembly directly coupled to the second vestibule panel and configured to collect condensate.

One disclosed system includes: (a) a fan directing an initial air stream to a heater with sufficient heating capacity to heat said initial airstream to a temperature of 200° C. to 350° C. and output a heated air stream; and (b) an air to air heat exchanger positioned and configured to use said heated air stream to preheat said initial airstream prior to its arrival at said heater. Additional systems and corresponding methods are disclosed.

One disclosed system includes: (a) a fan directing an initial air stream to a heater with sufficient heating capacity to heat said initial airstream to a temperature of 200° C. to 350° C. and output a heated air stream; and (b) an air to air heat exchanger positioned and configured to use said heated air stream to preheat said initial airstream prior to its arrival at said heater. Additional systems and corresponding methods are disclosed.

An HVAC system is provided. Embodiments of the present disclosure generally relate to heat exchangers having tubing with a reduced diameter compared to traditional systems. In one embodiment, a ducted HVAC system comprises an outdoor heat exchanger with tubing that has an outer diameter of eight millimeters (8 mm) or less and an indoor heat exchanger with tubing that has an outer diameter of nine millimeters (9 mm) or less. Additional systems, devices, and methods are also disclosed.

An outdoor unit is configured to accommodate a compressor and is connected to a refrigerant pipe used for circulating refrigerant between an indoor unit. The outdoor unit includes a bottom panel under the compressor to support the compressor, a first side panel on a peripheral edge of the bottom panel, a second side panel at a position facing the first side panel on the peripheral edge of the bottom panel, and an outdoor heat exchanger above the bottom panel and extending in a direction from the first side panel toward the second side panel, wherein the outdoor heat exchanger has an end portion facing one of side end portions of the second side panel, and the bottom panel includes a projection formed at a position corresponding to the end portion of the outdoor heat exchanger and protruding in a direction from the first side panel toward the second side panel.