An ideal air system is not mean to be a realistic piece of equipment. It's often used to calculate the building's heating and cooling loads or is used when the HVAC equipment is not known. It has a constant year-round COP of 1, though I believe you can specify a heating or cooling efficiency for it using the EnvironmentalImpactFactors object -- see the District Heating Efficiency and District Cooling COP fields.
If you want to model an air conditioning system, you can add a DX coil object to your model. Unlike an ideal air system, air conditioners and heat pumps will have COPs that vary throughout the year based on (primarily) outdoor temperature.
Same question as this.
Thank you. But... " This component can be thought of as an ideal unit that mixes air at the zone exhaust condition (or plenum outlet condition when a plenum is attached) with the specified amount of outdoor air and then adds or removes heat and moisture at 100% efficiency in order to produce a supply air stream at the specified conditions." This sentence is not saying that COP is 1. It's talking about the efficiency caused by specific components, the ideal system doesn't have specific parts, so efficiency is 100%
If COP of the ideal loads air system is really 1, it's unreasonable. In fact, air conditioning system's COP/EER is always bigger than 1. In reality, air conditioning system's COP/EER is among 3 to 6.