Did your local HVAC contractor suggest a PTAC Air Conditioner (Package Terminal Air Conditioner), but neglect to explain what one is? Often used in the hospitality industry, a PTAC is a self-contained air conditioner installed through-the-wall of rooms with an outside wall. One PTAC is installed for each room, and the occupant of each room can control the temperature of that room independently from other rooms. Some PTAC units include an optional heating unit as well. Energy Efficient You won't waste energy by heating/cooling rooms that are not being used.
Because PTAC units are typically installed in rooms with a wall leading directly to the outside, they don't require ductwork, which can substantially reduce both installation cost and the amount of space needed for installation. However, they are typically less efficient than central air conditioning systems, which increases their cost over time.
Moderate climates are best suited for PTAC Air Conditioners. Severe cold or hot weather will overwork the unit, compromising its efficiency.
Several companies manufacture PTAC Air Conditioners including: