When it comes to controlling the temperature of your home, there are plenty of high-tech solutions on the market. Both the Trane Nexia Comfort Link and Nest Thermostat can help you ease the cost of your monthly electric and heating bills. And both give you the ability to control the system remotely, using a smartphone or tablet, making them smart home systems. However, you'll want to assess some of the fundamental differences between your options before making a purchase.