UH71209 vs UH71214
images from manufacturer

It seems that there is no mechanism difference between Hoover UH71214 and UH71209 except for the color.
The color on the base of UH71209 is mostly red while the base of the UH71214 is red with black.

The same thing they have:
WindTunnel Technology cleans all floors better;
Multi-Stage Cyclonic Filtration traps dirt and dust before it reaches the filter with no loss of suction;
Washable filter with HEPA Media filter trap over 99.9% of small particles down to 0.3 microns;
25 ft power cable with auto cord rewind provide quick winding and neat cord storage;
Beater bar On/Off pedal makes it a snap to switch between hard floors and carpeting;
5 height settings adjust as needed to vacuum different flooring types;
10 ft stretch hose provides long cleaning reach with wand and crevice tool;
On-Board Tools, a Turbo Tool, 24″ Telescoping Extension Wand, Dusting Brush, Crevice Tool, for cleaning fruniture, lampshades, hard to reach areas, etc.
Have Bumper that protects furniture;
System Check Indicator light to remain you when the filter and dirt cup need to be checked;
13.5-inch cleaning path;
Weighs 18 pounds;
12 amps motor;
D-Shaped type handle;
Dual Cyclonic Air System;
limited 2-year warranty.

Do you know more difference between UH71214 and UH71209? If yes, we would appreciate you if you could share info here.