If your panel has 100 Amps available and you already have an air conditioning system, then there are options to avoid electrical panel upgrades. The following image shows how choosing highly energy efficient appliances and using Smart Circuit Splitters in a 2,500 square feet home with an 100 Amp panel can avoid a panel upgrade. Devices called “Smart Circuit Splitters” allow two high power devices to share one 240V circuit. It will prioritize the electric load for one device and pause the other device. It also allows you to avoid the need for new wiring if two appliances can share the same outlet.
Image source and more resources on watt diet : Redwood Energy Watt Diet Calculator