Can i connect all of them to my arduino Uno R3 ?

Thanks for GREAT answer !!!

--LCD http://www.futurehouse.gr/index.php?main_page=product_info&products_id=3142

--Keypad FHouse Corporation

--2 Fans (no speed control , only on/off) FHouse Corporation

--3 input pins (CO2 sensor, temperature, water)

--LED , i will have 3 groups , 15 + 15 + 10 , i will light each group separately

--GSM shield FHouse Corporation