two multi-zone options to be used with cassettes

 The primary difference between the MRCOOL OuttaSight cassette and the Olympus cassette lies in their intended use and the features they prioritize. The OuttaSight cassette is designed for discreet, low-profile installations, while the Olympus series emphasizes efficiency and advanced features.

 MRCOOL OuttaSight Cassette:

• Focus: Discreet installation, low-profile design.
• Ideal for: Applications where aesthetics and space-saving are key priorities.
• Features: Low-profile design for seamless integration into any space. 
• Size: Has a 9K cassette, Olympus starts at 12K.
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 MRCOOL Olympus Cassette:

• Focus: Efficiency, advanced features.
• Ideal for: Users who prioritize energy efficiency and advanced functionalities.
• Features: May offer features like multi-zone control, smart home integration, and high-efficiency performance. 

In essence: If you prioritize low-profile, discreet installation, the OuttaSight cassette is a good choice. If you prioritize energy efficiency, advanced features, and perhaps multi-zone control, the Olympus series might be a better fit.

The MRCOOL OuttaSight  4th Gen system is considered DIY. The Olympus is not DIY. A HVAC professional must install the Olympus® mini-split system.