Do you mean they are hyper and chatty or whinging a lot? Either way, ear plugs might save your sanity and patience. Just foam ones to dampen the sound a bit. I find the pitch of toddler whining to be excruciating so if you can dampen that down I'm sure you'd cope a lot better.
For calming down, how old are they? Nearly 3? Have they dropped a nap yet? Maybe the need a longer nap or maybe they've dropped naps but still need a rest time allocated in the day.
I'd have a think about when they are most hyper during the day. Look at the time where they seem the most high/restless/agitated etc, and introduce a quiet time to your day. If they are happy and hyper that might be the time of day you need to make sure they're getting a good run outside, but if they're whining and agitated then I'd pick that time to introduce quiet time. They're maybe tired but not enough to nap.
Set up a nice calm space somewhere in the house that's the go to place for quiet time, dim the lights, maybe have some sensory lights on, sit quietly with each other and read books or make a quiet box of activities that will engage them but are soothing. If it doesn't make them more hyper maybe choose some quiet calm programmes to watch on the tv. Keep up the routine and have that hour of quiet time each day. They'll need your support to sit and enjoy quiet time to begin with but eventually they should seek it out and enjoy that part of the day the same way they used to need a nap.
I think happy and hyper = run around at the park, whiny/agitated/upset= quiet time with mum.