An air conditioning apparatus comprising: a compression mechanism ; a heat source-side heat exchanger ; an expansion mechanism ; a usage-side heat exchanger ; a blower for feeding an air flow to said heat source-side heat exchanger ; a housing (2a through 2e) which has a bottom plate and accommodates said heat source-side heat exchanger and said blower in a space above said bottom plate ; and a bypass circuit (H)being arranged and configured to connect a third refrigerant tube (A) on a discharge side of said compression mechanism , and at least any one of a first refrigerant tube (C) which extends from said usage-side heat exchanger to said expansion mechanism , and a second refrigerant tube (D) which extends from said expansion mechanism to said heat source-side heat exchanger , characterized in that the bypass circuit (H) is disposed so as to pass below said blower and below said heat source-side heat exchanger , wherein said bypass circuit (H) passes below said heat source-side heat exchanger after passing below said blower from said third refrigerant tube (A), and extends to the at least any one of said first refrigerant tube (C) and said second refrigerant tube (D). a compression mechanism ; a heat source-side heat exchanger ; an expansion mechanism ; a usage-side heat exchanger ; a blower for feeding an air flow to said heat source-side heat exchanger ; a housing (2a through 2e) which has a bottom plate and accommodates said heat source-side heat exchanger and said blower in a space above said bottom plate ; and a bypass circuit (H)being arranged and configured to connect a third refrigerant tube (A) on a discharge side of said compression mechanism , and at least any one of a first refrigerant tube (C) which extends from said usage-side heat exchanger to said expansion mechanism , and a second refrigerant tube (D) which extends from said expansion mechanism to said heat source-side heat exchanger , characterized in that the bypass circuit (H) is disposed so as to pass below said blower and below said heat source-side heat exchanger , wherein said bypass circuit (H) passes below said heat source-side heat exchanger after passing below said blower from said third refrigerant tube (A), and extends to the at least any one of said first refrigerant tube (C) and said second refrigerant tube (D). a third refrigerant tube (A) on a discharge side of said compression mechanism , and at least any one of a first refrigerant tube (C) which extends from said usage-side heat exchanger to said expansion mechanism , and a second refrigerant tube (D) which extends from said expansion mechanism to said heat source-side heat exchanger , characterized in that a first refrigerant tube (C) which extends from said usage-side heat exchanger to said expansion mechanism , and a second refrigerant tube (D) which extends from said expansion mechanism to said heat source-side heat exchanger , characterized in that the bypass circuit (H) is disposed so as to pass below said blower and below said heat source-side heat exchanger , wherein said bypass circuit (H) passes below said heat source-side heat exchanger after passing below said blower from said third refrigerant tube (A), and extends to the at least any one of said first refrigerant tube (C) and said second refrigerant tube (D). <EOS>