Mitsubishi Ductless Systems Mitsubishi Ductless Systems Known as the Cadillac of ductless systems, the Mr. Slim line-up is a great alternative to add cooling and even supplemental... zone system usually takes only 1 day to complete followed by power wiring and start-up. We are proud to be a Mitsubishi Diamond Contractor and offer all of the ductless systems... available from Mitsubishi. Please contact our Design Consultant to see how easy it will be to install a ductless cooling and heating system into your home today! ...