condo thermostat change
Find your transformer and look for a label/stamping that states it's rated voltage (should be AC voltage). It could be a 24V x-frmr putting out 30V...seems a little high, but there are variables involved. If it's 24V you should be able to hook up a digi-stat, but you'll need to determine which of the red wires is supplying the 24V, which can be done with a volt meter and an extension cord. Turn the stat off (or turn it way down...so the heat doesn't want to kick on) put one test lead into the ground hole of the ext cord, and touch the terminals of the red wires. One should show 0V and the other 24V. The one showing 24V will go on the 'R' term of the new stat, and the other (red) will go on 'W' of the stat. Leave the 2 blacks as there are.
As far as what digi-stat to get...get what you like...I wouldn't go 'over-board' as this stat only does heating cycle, right?? No A.C. ??