[McSteve]

Are any circuits in your house not working?

Since you've got a voltmeter, check to make sure you have 240V. Check either at the lugs where the service wires attach to your main breaker in the panel, or at an electric dryer or range outlet. You should have 120V from each hot to ground, and 240V between the two hots.

The only thing I can think of is that the new meter is somehow seated wrong, or one of the meter jaws broke when they replaced the meter. That could cause one half of your 120V circuits, and all of your 240V circuits to be dead.

Or it could be coincidence.

 

[McSteve]

I forgot about that. If they also added a small box near your outside A/C unit, they are now able to remotely turn your AC on and off during peak demand times. They usually give you a discount on your bill for this. But I think they usually only turn your AC off for maybe 15-20 minutes at a time, so if it's been dead longer than that, something is wrong.