Lots of factors determine the life of any Heating and Cooling System. Proper installation and maintenance will ensure you get the longest life at the most economical price.
Programmable thermostats are great for people with set schedules. They allow you to change the set points on your thermostat when no one is home to allow for energy savings. While returning to your comfort set points when you are home.
WIFI thermostats allow you to stay connected through your mobile device or computer to keep track of your system and your energy consumption. They are perfect for people on the go and most are compatible with home automation.