Fujitsu 18,000 BTU 20.8 SEER Compact Cassette Single Zone SystemFujitsu 18,000 BTU 20. 8 SEER Compact Cassette Single Zone System is the perfect product to use to heat and cool a space where you can fit the indoor unit into drop ceilings, retrofitted framing, and other ceiling spaces. You can use this system if you do not want any units on your walls or floors. This system comes with an out of the box 7 year compressor 5 years part warranty, 10 year warranty if its installed by a licensed HVAC tech and registered