It may be getting about time to replace that old thermostat on your wall, especially if it is the old mercury style. At Environmental, we do not recommend attempting to install a brand new thermostat yourself. It is always best left to a certified professional as they are able to ensure that you are putting up the right thermostat for your particular system and that it is installed correctly. Especially now with the invention of the more complicated "learning" thermostats like the Nest. However, there's probably a lot of you out there who will still do it yourself to save some money, which is completely understandable.
Well, for all you do-it-yourselfers out there and anybody who would just like some great general knowledge about the process, we have a youtube channel that you can check out at http://www.youtube.com/user/Environc. There's also a couple more videos on there with some great general knowledge stuff, so just subscribe for free to the Environmental youtube channel and stay in the know! As always, thanks for reading!