4 Majors Different when you considering window unit air conditioner or split system air conditioner. Installation location, Price, Energy Costing, Flexibility.
Installation Location - Window Unit Air Conditioner only recommended to install at upper floor, it reduces the security of your home.
Price - The initial costing for window unit air conditioner is cheaper than split system air conditioner.
Enery Costing - moslty window unit air conditioner does not have eco saving mode compare with split sstem air conditioner, hence windows unit air conditioner will cost higher electricity fee.
Flexibility - Windows unit air conditioner only able to install at windows, but split system air conditioner able to install at any place you wish.