The Hoover Wind Tunnel S3755 is a canister vacuum with a 22-foot-long cord and a 6-foot-long hose. The unit comes with a HEPA filter and is bagless, with a dirt container that can be emptied directly into a waste bin. It can be used on carpet as well as hard floors and has a headlight for additional illumination. The vacuum also comes with a dusting brush and crevice tool and has a finger-touch control system.
The Hoover Wind Tunnel S3765-040 is also a canister-style vacuum. It weighs approximately 30 pounds and is 28.1-by-15.7-by-13.5 inches in size. It is bagless with a HEPA filter system and has a finger-touch control system. The vacuum has a 12-amp motor, variable suction and can be used on hard floors or carpeting.
There are many more similarities than differences for these Wind Tunnel canister models. Both are bagless with a HEPA filter and fingertip control on the handle and have the same tools. Both units can be purchased online and in stores and come with a limited warranty.
The S3765-040 model has 15 power nozzles and a deluxe pump handle that are missing from the other model. Otherwise, the models are nearly identical in size, shape and function.