A centralized air conditioner solution adds increased home resale value, so you recoup more of your investment if you sell your home. The biggest factor, however, is that three window / wall units typically use more energy than a single centralized system.
 
Also consider that three rooms are a large portion of the home, and every time you travel between cooling zones with a window / wall unit, you're leaking cool air, making your unit work harder. However, neither unit will work efficiently and save money unless it is properly sized. Carefully research your choices before purchasing.

Small Size House (65m2) From as little as R 60 000 ex vat

3 x 20 m2 bedroom
1 x 50 m2 Open plan living area
Individual temperature control
Regulated power consumption
​Temperature sensors
Centralized tablet use
Off site wireless remote operation

Medium Size House (125m2) From as little as R 90 000 ex vat

3 x 25 m2 bedroom
1 x 50 m2 Open plan living area
Individual temperature control
Regulated power consumption
​Temperature sensors
Centralized tablet use
Off site wireless remote operation

Large Size House (200m2) From as little as R 120 000 ex vat

4 x 25 m2 bedroom
1 x 50 m2 Open plan living area
1 x 50m2 Entertainment area
Individual temperature control
Regulated power consumption
Motion sensors
Centralized tablet use
Off site wireless remote operation

My lights - Optional extra 
IOT devices are compatible with tablet
Social media interface
Browser functionality
Security solutions coming soon