If it looks like this
Performance Edge Programmable Thermostat - TP-PRH01-B | Carrier - Home Comfort
Then they don't want you to be able to change it. I have wanted to change my minimum setting to 65 deg so I may try and research how to do it.
Set Thermidistat Control Configuration
Configuration options enable the installer to configure the Thermidistat Control for
a particular installation. Most are not presented to the homeowner and therefore
must be properly set by the installer. (Only those marked with an asterisk * below
are available to the homeowner.) The homeowner configurations are described in
the owner’s manual. A special procedure allows entry into the configuration mode.
Selections can be made while in configuration mode. Description of each selection
and how to use the configuration mode follows.