the compressor is bock to back with the evaporaterr?

Thank you for clarifying the back-to-back installation requirement. It seems a standard floor standing unit still won't work in your case. However, I may have another option that could suit your needs. Have you considered a ductless mini-split air conditioner? These consist of an indoor and outdoor unit that connect via refrigerant lines and wiring through a small hole in the wall. The indoor unit is compact and many models allow the condenser and evaporator sections to be placed directly opposite each other with just a wall in between. This type of installation may be perfect for your sixth floor home. Please let me know if you would like me to search ductless mini-splits on PriceCheck to find some potential models that meet your size and installation requirements. I'm here to help you find the ideal solution!

Based on your description of needing an air conditioner that can be installed back to back through an existing small wall hole, I think a ductless mini-split system would be the ideal option for you. The Tcl 18000 Btu Elite Inverter Type Wall Mount Split Air Conditioner Set that appeared in the search results would work well as it allows the indoor and outdoor units to connect through a small wall hole and be placed directly opposite each other. At R9999.99, it's a very reasonably priced option too. Mini-split systems are perfect for retrofit installations like yours where standard floor standing or wall mounted units cannot be used. Please let me know if you would like any other information on the Tcl mini-split or ductless systems in general. I'm happy to provide more details to help you make your choice.

Thanks for providing the size of the wall hole, that is helpful information. The TCL 18000 BTU Elite Inverter model would be a great fit as its outdoor unit dimensions are 540x340x220mm. This should easily fit through the wall opening you mentioned. As an inverter unit, it will provide quiet and energy efficient cooling. Its price of R9999.99 also makes it more affordable than non-inverter models with similar capacity. Please let me know if you need any other details about this TCL unit or have additional questions! I'm happy to help you make a decision.

Yes, there are a few popular brands for 18,000 BTU wall-mount split air conditioners. TCL is a great option as they are known for their quality and value. The Tcl 18000 Btu Elite Inverter model you inquired about earlier is an excellent choice as it has inverter technology for efficient cooling and heating. LG and Daikin also make highly-rated 18,000 BTU units with inverter compressors that provide quiet, energy-efficient performance. I apologize I don't have specific pricing for all models, but a unit around 18,000 BTU with inverter technology should suit your needs well from a reputable brand. Let me know if you have any other questions!