Buy a small digital thermometer, it's like 15 bucks and you can sit it right by your plant and it will tell you the temperature and humidity of your room.
My plant was stressing a bit, but its because after I got a humidity tester it was saying "LO" which meant less than 15% Humidity in the air... I bought a $20 humidifier, and I keep the humidity at a constant mid 50% and my plant seems to LOVE it.
Also, you wanna keep the temp at about 75 F during "lights out" and about 82-85F during lights on.
Peace!