Then, the mini split will condition the fresh air properly before supplying it into your house. So, if you’d like to turn up the heat in your bedroom, you’re not spending money and energy to also pump warm air into empty rooms in your house. Mitsubishi 18000 Btu Heat Pump Ductless Mini Split With Ceiling Cassette 207 Seer 3250 nw 107th avenue, doral, fl 33172 call us at: How does a mini split cassette work . Ceiling cassette indoor air handlers are mounted in the ceiling. Two key reasons are the type of installation and the location. The outdoor unit of a cassette air conditioner is mounted outside; In much the same way as it would be for a conventional wall mounted split system unit. All ductless heat pumps contain two heat exchanger coils, one used to condense the refrigerant and another to evaporate it. A ductless heat pump system transfers heat through a pattern of evaporation and condensation as a refrigerant substance runs through the system. This is what yo...