Wi-Fi and Programmable Thermostat


Control your Home Comfort with a Programmable Thermostat


This past week I bought a wifi thermostat to replace the programmable thermostat that controls the first floor of my home. During installation I found out that currenting wiring is not compatible with my new wifi thermostat. This is going to become a common issue issue as wifi thermostats become cheaper and more common in homes. The big question is what is the difference between a programmable thermostat and a wifi thermostat and what is the benefit.


Programmable thermostats are a great way to help you save on your energy usage and tailor your heating and cooling to your needs. Most programmable thermostats allow you to schedule a week schedule with 4 time point throughout each day. This allows you to schedule when your heat or cooling will turn on for during the weekdays and the weekends and at what time each day. The best times for the schedule to run would be before you wake up, when you leave for work, before you return home, and before you go to bed. Programmable thermostats give you an added level of control over standard dial thermostats that have one static temperature unless you change it on your own. Having to change the temp on your own doesn’t let you wake up to a warm house in the morning or unnecessarily heat a home when no one is home.


Wi-fi or smart thermostats are part of the connect home or the internet of things (IoT). These allow you ask smart hubs like an Amazon Echo or Philips hub or Siri to change the temperature of the room without ever going to the thermostat itself. They have the same features as a programmable thermostat like scheduling but in some cases also feature geo-fencing and adaptive scheduling, where it learns your routine. Geo-fencing allows the thermostat to know when you leave your home or a pre-defined area, this will force it into away mode where it’ll use less energy to heat or cool your home. Once you get back into that area your thermostat will go to your home temperature allowing you to step into a warm home.


Thermostats like the Honeywell Lyric, the Nest, and ecobee all require a common wire to help to power the thermostat. Most older heating and cooling systems don’t have this wire, some do but may not be used prior to your wifi thermostat needing them. The wiring for you heating or cooling system will feature anywhere from 2 to 5+ wires that control whether heat or cool air is called. Each wire controls something, for a system that is just heating you’ll find two wires that are being used the red and white wire. For heating and cooling systems you’ll more than likely see four wires being used the red and white for heat and the blue and green to control fans and turning on the ac. If there is a fifth wire, that is the common wire. The common wire is there to help with the add electrical need of the thermostat. In some cases you can move the fan wire which is usually yellow or green to the common but the fan will continuously blow. If you are worried about installing a new wi-fi give your heating and cooling company a call to have them install it.

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