A nasal delivery device for delivering substance to a nasal cavity of a subject, the delivery device comprising: a container-receiving unit (16) comprising a container chamber (23) for receiving a substance-containing container (C) which contains substance to be delivered to the nasal cavity of the subject, the container chamber (23) including an inlet (24) and an outlet (25)； a nosepiece unit (17) including a nosepiece (47) for fitting to a nasal cavity of the subject and being in fluid communication with the outlet (25) of the container chamber (23)； and a mouthpiece unit (19) including a mouthpiece (77) in fluid communication with the inlet (24) of the container chamber (23) and through which the subject in use exhales, such as to entrain substance from the container (C) and deliver the same through the nosepiece (47), and an air chamber (78) which fluidly connects the mouthpiece (77) to the inlet (24) of the container chamber (23), wherein the air chamber (78) incorporates a temperature regulator (79) for cooling an air flow as exhaled therethrough.
