UPDATE:
They came and installed the Ecobee 3 Lite. I did end up buying a "cheap" thermostat as I know they were going to confiscate the one already in my house (although not "so" cheap, it was brand new!). I should have scoured more garbage bins for old discarded thermostats or got one off eBay but I didn't think I would have the time.
My stupidity.... the cheap new one I bought so they would confiscate it cost me $30, so that they could install an Ecobee 3 Lite worth about $220 here in Canada, and this way I kept my original $100 thermostat.
So in my mind I paid $30 for an Ecobee, and I kept my old one in case the wife wants to kill me and I have to quickly switch it back.
Anyways, it turns out they installed the "PEK" module (Power Extender Kit) since I only had the 4 wire cable in my wall. They also used a huge round wide wall-plate behind the Ecobee which hides the previous hole and any traces of the old thermostat. I'm still getting the hang of using it, I have NOT programmed it yet either.
One question I have which the installer said NOT to ever do.... SET IT TO AUTO and set a RANGE of high/low. Why?
He said to either keep it in heat mode, or cool mode and switch accordingly, but never auto. Let's say I like my temperature between 20 and 23. So I figure in the winter when it is cold outside, even if in AUTO the natural tendency will be for the house to cool down... so as soon as it dips below 20, the heat turns on and bumps it back up above 20. I doubt it will ever reach 23, so the air conditioner will never activate. Same goes for summer... the natural tendency may be for the place to heat up and always be over 23, so the air-conditioning will kick in. Again, I doubt it will go below 20. So why not auto? That helps during the spring/autumn when days are cold in the night and hot in the day, with wild swings. Wouldn't it be better to have it on auto so we don't constantly play with the thermostat figuring out what to do all the time?