Acs are a much harder problem to solve than EVs.
- First the instantaneous load, EVs don't require torque to charge like compressing a fluid. Fast charging has limitations on when it's optimal to use for the batteries and charging systems are capable of negotiating with the grid.
- Time of Use (hourly). Unlike an AC, not every ev needs to be charged at reasonably the same time based on regional similarities (the worst time for the grid is when multiple hvac compressors try to start at the same time). Given a low amp slow charge (about 1/3 the needs of ac) an ev can still fully charge while over 12 hours while the user is at home.
- Time of Use (daily). When the average commute is 20 miles a day and the average car has 200 mile range, the likelihood of every car needing to be fast charged at the same time on the same day is very unlikely.
Tldr; electric vehicles are an extremely easy load relative to hvac and its usage patterns.
The most obvious Internet connected optimization is that electric cars should turn off fast charging during a given 5 minute hvac compressor cycle (up to 30 minutes an hour)
ps. Internet connected thermostats and EVs already offer time of use optimizations.