Home AC System

I wasn't happy about having to go get $8900 out of my 401(especially with the penalty I'm gonna have to pay the IRS)to have my furnace and central air replaced a couple of weeks ago, but the guy used the same thermostat as was there with the old setup and it seems to be working fine ..
Those programmable ones you can adjust the conditions within your house from your phone from anywhere aren't worth it and I want no part of one like that