Is it possible for one to have two thermostats for one small home HVAC system? I would need it so that only one of the thermostats would be usable at any given time.

I have a nice large touch screen programmable thermostat now in my home--I like the programming features & the neat LCD color display.

I have looked at the Wi-Fi thermostats at Home Depot & like the idea of controlling my thermostat while away at work with my phone or Ipad or PC.

Thus, I would like to still use my current LCD thermostat while I am at home, and upon leaving for work every day, to be able to "switch off/disconnect" the LCD one & "switch over" to the Wi-Fi thermostat so I can monitor temp during day from phone/Ipad, and then switch back when I get home.

Is this possible?