SPKloppers:
I am not sure which Arduino device will be perfect for this project:
- Inputs: 2 (DHT11/21/22) Sensors
- Outputs: Some indicating LED's and 2 fans
Each humidity sensors will need one digital I/O pin.
Each fan will need one digital output pin (a PWM output pin if they are low-voltage DC fans and you want speed control).
Each LED will need one pin.
Any Arduino can easily handle the task. I would recommend the Arduino UNO which is the most common kind and easy to get help with.