Some of the differences between DC24 and DC25 Multi Floor:
Dyson DC24 versus DC25 
images from manufacturer
- Suction Power
DC25 is much more powerful.
DC25 has a suction power of 220 air watts while DC24 has only 115 air watts.
- Price
DC25 is more expensive.
DC25 is priced at $499.99 while DC24 is priced at $399.99 at Dyson.com ( prices checked on July 29, 2011 ).
- Bin Capacity
DC25 has a bigger bin.
The bin capacity of DC25 is 0.31 gallons while it is 0.19 gallon on DC24.
- Weight
DC24 is lighter.
DC25 weighs 16.12 pounds while DC24 weighs 11.65 pounds, so it is easier to carry DC24 up and down stairs.
- Dimensions
DC24 is smaller.
The dimensions of DC24 is 29.6″ x 11.0″ x 13.7″(HxWxD) while the dimensions of DC25 is 42.4″ x 12.2″ x 15.4″(HxWxD). DC24 takes up less space to store.
- Tool
DC25 comes with a Stair Tool and Combination Accessory Tool while DC24 has only Combination Accessory Tool.
- Cord length
DC25 has a longer cord.
The cord length of DC24 is 20 feet while DC25 has a 24.6 foot cord. Both of them are short compared to many other upright vacuum cleaners.
- Wand
The wand of DC24 is shorter than the DC25.
If you want a lightweight upright vacuum cleaner for small apartment or a vac you can carry to clean stairs, you should choose DC24, otherwise you may want to consider DC25.