A fresh-air cooling system for a building structure having an unvented attic is provided. The system provides airflow pathways that allow outside air to be drawn through, and discharged from, a building having an unvented attic. Dampers with a low thermal conductivity regulate airflow through the building structure. The system allows a whole house fan to cool a building having an unvented attic. The system seals or otherwise alters airflow pathways through the building structure in order to reduce heat transfer between the building and the outside environment when the cooling system is not in use.

A fan shroud for a heating, ventilation, and/or air conditioning (HVAC) unit may include an outer wall to couple to a housing of the HVAC unit and an inner wall disposed within the outer wall. Additionally, the inner wall may be air permeable. The fan shroud may also include an acoustic damping material disposed between the outer wall and the inner wall. The fan shroud may encircle a fan of the HVAC unit to reduce noise.

A heating, ventilation, and/or air conditioning (HVAC) packaged unit includes a first refrigerant circuit component configured to change a temperature or a pressure of a refrigerant flowing through the first refrigerant circuit component and a second refrigerant circuit component configured to change a temperature or a pressure of the refrigerant flowing through the second refrigerant circuit component. The first and the second refrigerant circuit components are within a common refrigerant circuit that is disposed within a common support structure. The HVAC packaged unit also includes an interconnection conduit having a length formed from aluminum, a first end segment coupled to a first end of the length, and a second end segment coupled to a second end of the length. The first end segment and the second end segment are each formed from copper, and the interconnection conduit extends between the first refrigerant circuit component and the second refrigerant circuit component.

A curb assembly for a heating, ventilation, and/or air conditioning (HVAC) system includes a frame configured to couple to a curb of a structure, a pedestal system configured to couple to a housing of the HVAC system and to the frame, such that the pedestal system extends from the housing to the frame, and an adjustable duct connector configured to fluidly couple an air flow passage of the housing with ductwork of the structure. The pedestal system is configured to enclose a space formed between the frame and the housing and the adjustable duct connector configured to be disposed within the space.

The present disclosure relates to an HVAC system door assembly that includes a door that includes a panel having a first side and a second side opposite the first side, and a first seal circuit. The first seal circuit is disposed on the first side. The HVAC system door assembly also includes a door frame that includes a second seal circuit. HVAC system door assembly further includes a ridge projecting from one of the first seal circuit or the second seal circuit configured to align with and engage a central portion of the other of the first seal circuit or the second seal circuit when the door is in a closed position with respect to the door frame. The ridge includes a cross-sectional profile having a flattened peak section with sloping side sections that extend from boundaries of the flattened peak section to a base of the ridge.

A fresh air cooling and ventilating system can include a whole house fan for introducing fresh air into a building structure. The fresh air cooling and ventilating system can include a whole house fan and/or a controller. The controller can be operably in communication with an air conditioning system and coordinate the usage of the fresh air cooling and ventilating system and the air conditioning system to reduce overall energy consumption. The system can be automated to run with no or minimal user input.

A heating, ventilation, and/or air conditioning (HVAC) unit includes a base plate having a receptacle configured to receive a lifting lug, a bracket having a mounting plate coupled to the base plate proximate the receptacle, and a ledge of the bracket extending away from the mounting plate and offset from the receptacle such that a distal portion of the ledge is configured to block the lifting lug from contacting an outer surface of the HVAC unit when the lifting lug is in an engaged configuration with the receptacle.

A multifunction adaptive whole house fan system can include a whole house fan to pull large volume of air through a building structure. The whole house fan can pull air from a motorized window or damper into the building structure and expel air through an attic. The system can monitor the environment to operate the whole house fan when desired conditions are present in coordination with other systems of the building structure to reduce overall energy consumption.

A multifunction adaptive whole house fan system can include a whole house fan to pull large volume of air through a building structure. The whole house fan can pull air from a motorized window or damper into the building structure and expel air through an attic. The system can monitor the environment to operate the whole house fan when desired conditions are present in coordination with other systems of the building structure to reduce overall energy consumption.

A heating, ventilation, and/or air conditioning (HVAC) packaged unit includes a first refrigerant circuit component configured to change a temperature or a pressure of a refrigerant flowing through the first refrigerant circuit component and a second refrigerant circuit component configured to change a temperature or a pressure of the refrigerant flowing through the second refrigerant circuit component. The first and the second refrigerant circuit components are within a common refrigerant circuit that is disposed within a common support structure. The HVAC packaged unit also includes an interconnection conduit having a length formed from aluminum, a first end segment coupled to a first end of the length, and a second end segment coupled to a second end of the length. The first end segment and the second end segment are each formed from copper, and the interconnection conduit extends between the first refrigerant circuit component and the second refrigerant circuit component.