DHT22 and DS18b20 sensors running on an ESP8266-12 programmed with the Arduino IDE monitor attic conditions and heating/cooling system performance. Over-the-air (OTA) updates are implemented. Power is from mains with Lithium-ion cell backup.
This is the complete sensor suite at a particular time. Atmospheric pressure is adjusted to sea level. This data is acquired with an ESP8266 Wemos using the source code at https://github.com/kentaylor/esp8266-weather-station.