As I noted earlier, these blowers are used in thousands of coolers at retail successfully. The biggest issue they face is the bartendars use the kegerator for refrigerating just about anything the can including pickled turkey gizzards! Everytime they open the door, the unit absorbs heat thus affecting the performance of the dispensing.
If the heat of these blowers is a concern, try using a fan from a computer hardrive and maybe point into a funnel to the flex tube.
Also, vinyl tubing is highly permiable. The carbonation can leach out resulting in flat beer if it sits in the line to long.
Scott Zuhse, Instructor
Micro Matic Dispense Institute