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Willis Power Systems, LLC
2950 N. Martin Springfield, MO 65803
Toll Free: (800) 825-4631
Phone: (417) 831-2520
FAX: (417) 831-0030


"I own seven premium Willis units and two compact Willie units. Dollar for dollar, this is the best unit. Nothing on the market is as efficient on fuel. I've tested a competitor on my trucks and the Willie still burned significantly less fuel in an eight hour period. I have to go by what I see and what my drivers tell me, and I've done a lot of research. You pay for what you get... this is the only APU that gets my trucks below 72 degrees on the hottest day of the summer." 

 - Leland Crank
    Crank Enterprises, Inc

"There is no other system that cools like a Willis! Period! It also maintains battery strength, supplies ample heat and allows me to rest comfortably in the far out places that we, as drivers, venture."

 - Jon Modlin

Doug has driven a truck with a Compact Willie for 14 months and says he "loves it because it really works." Doug also says that "it is a good unit."

 - Doug, July 24, 2012 
    Driver for Nick Strimbu Inc. 
    Brookfield, OH