On Tue, 31 Jan 2017 08:26:07 -0800 (PST), trader_4
wrote:

Cooktop is usually 20a but may spec a 30a circuit. A new 3 ton AC
pulls 15-16a at the condenser (ampacity of conductor 19.5a, 35a
breaker)

New 5 ton here. 50A breaker, and like I said, guessing maybe 25A,
but maybe it's less. It sure uses a lot less electricity than the
old one.

Sounds about right.
All of that info should be on the sticker on the condenser. That is
the guide for sizing conductors and breakers.
This is a link to the UL marking guide that explains what is on that
sticker

http://www.ul.com/wp-content/uploads...4/EHCMG_AG.pdf