Geothermal air conditioning units offer the most energy-efficient cooling option of all the various air-conditioning options, but it’s fair to note that it can be quite costly to set up.

Mini-split AC unit installation cost varies by type, size and number of HVAC zones. ... Floor-Mounted. For between $1,300 and $3,700, homeowners can install a floor-mounted mini-split AC.

Also known as ductless mini-split air conditioners and heaters, they consist of one or more wall, floor, or ceiling-mounted indoor units connected to an outdoor compressor.

Best air conditioning units to keep your home cool this summer. ... although they take up less floor space, ... Best for large wall-mounted air conditioner: Daikin Stylish - £595, ...