ADA requirements may keep it to 54" if it can be side reached, or if forward reach is the only way to approach with wheel chair 48" max.

The fact that 60" is a good height for temp sensing makes no difference to the ADA requirements.

Trane makes a nice remote sensor for use in this kind of situation.

A conventional looking thermostat that can be placed anywhere you want and install the remote sensor where it will work the best.

Bob Badger
Construction & Maintenance Electrician
Massachusetts