A:
Hi this is Jessica with Dyson Customer Service.
The primary difference is technology. The DC25 and DC40 provide similar power, size, bin capacity and cord length, and both machines are equipped with the Dyson Ball for greater maneuverability. However, the DC40 features our newest cleaner head and cyclone technology. The cleaner head on the DC40 includes an active base plate to ensure optimal contact with all floor types and the radial cyclones maximize suction power.
Please let us know if you have any additional questions and we will get back to you as soon a possible.
Best wishes,
Jessica
Dyson Customer Service