A typical A/C System has a single temperature sensor built into the thermostat. In Florida it had to be so many feet away from a door way because when you open the door the hot air rushes into the home. However this causes the A/C to kick on a lot. These days there are guidelines on setting up a location for a Thermostat.
Central location.
Interior walls only.
Away from Doors, Windows and Skylights.
Away from Air vents.
52 inches to 60 inches above finished floor.
If your Home is a few years old then the Thermostat should be in a more modern up to code location. If you have a much older home you might need to think about moving the thermostat to a new location that fits those guidelines above.
However you can go further by adding more sensors to the Climate control so it can average up the Sensors and get more optimum usage out of the system.
There are too many Thermostats on the market that can do this to list but from myself doing research and talking to A/C professionals out in the field they all confirmed that Nest sucks and Ecobee isn’t much better. However I have heard good things with Honeywell and Trane but they are costly and it uses the Cloud. When I deploy Smart devices I want to use the Cloud as little as possible if not at all. Reason being I don’t want to be limited to a End of Life cycle and wake up one morning and the device no longer works because it can’t access some remote server.
One I have been looking into is the Venstar T7900. It has Cloud support but also has a local API so you can turn off the Cloud support and just use the API. There is also a MQTT project for the Thermostat as well and a Home Assistant integration. Most of all there is an option to include a external Sensor and ways to add multiple Sensors so you can have Sensors in different places such as the Living room hallway and maybe the Master bedroom.
If you just want a smart thermostat and want to use the cloud and not into the whole Home Assistant thing then I would go with the Honeywell T5.
Most importantly you need to check and see if your A/C system can even support a Smart Thermostat. Most Smart Thermostats require a “five wire” also known as the “C Wire” for it to work. So if you have a older four wire you might have to hire a A/C professional to see if it can be converted. Some Thermostat manufactures have Adapters to convert the four wire to five wire.
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