Earlier quoted context omitted.
IceBear went out of business with the opposite tech: tanks of water storing the cold generated from excess AC cycles. Cheap electricity can make cold, and then a fan can convert the cold water into cold air during peak hours when electricity was costlier. Fans still took electricity to run, but it'd only be a few hundred watts to run air-conditioning rather than kilowatts of power.
IceBear was competing directly with ever cheaper PV. It's a tech for time shifting cheap overnight energy to the expensive daytime. Installing PV gives you cheap power directly and correlates with air-con demand.
You still need aircon at 7pm after the sun begins to set and while solar is losing power.
Cooler temperatures aren't until 10pm or so, hours after sunset.