I never let humidity get above 50% during flower and for the last couple weeks the target is 40% and below. I bought a 25 pint Frigidaire dehumidifier at Lowes for $150, it does a great job but needs the tank emptied often - or if you have a drain handy to can hook a hose to it and make it automatic draining. But $150 is like a half ounce of product. Controlling temperature and humidity will give you more yield and pay for itself.