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From the Input/Output reference:

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.

Therefore the Ideal Loads Air System COP is always 1.

If the heating energy is lower than you would expect, it might be due to not specifying the right amount of outside air. The answer to this question pertains to specifying outside air for the ZoneHVAC:IdealLoadsAirSystem.