An exemplary heating, ventilation, and air conditioning (HVAC) system for a building includes a primary heat pump system having a primary heat pump system size, a secondary heat pump system having a secondary heat pump system size less than the primary heat pump system size, a thermal energy storage system, and a control system operable to control operation of the primary heat pump system and the secondary heat pump system. The control system may limit operation of the secondary heat pump system to a first time period, and operates the primary heat pump system according to demand of the building.