Humidity. Is it important?

Ever since i went from an air conditioner to a heater in my room the humidity dropped stupid low (20-15%). I know its ideal around 50%. What would happen if I just let this be? Would it lower production or even kill the plant? Is humidity that big of a deal?

My humidity has been below 30% for the majority of my run...some days it gets down to 10% cause I'm in the desert...my ladies are totally fine - I had a few problems with nute deficiencies but that was unrelated to the humidity. Lower humidity is much much safer than high humidity. Powdery mildew is the devil

My humidity during veg was between 20 to 30 percent now during flowering it is constantly at 10 percent and i have not noticed any affects really my trainwreck is looking great and its got two weeks left so i dont think it really is that big of a deal. Maybe some strians very but i have three diff plants in the same room and their all doing just fine. Only thing is they drink more and i think the soil drys out faster but i keep them loved so thats not a problem for me just my little input

My plants suffered a bit from a low humidity problem I had when they were in veg. The leaves stared to get almost rough looking and they were smallish. I got a humidifier for my room and they recovered nicely. During bud phase, lowering the humidity is ideal as Cann suggested to prevent mould. I read if you can really lower it in the last two days of the plants life, it will force the plant to produce more THC to protect it's self...thoughts on this anyone?

Air conditioning acts as a dehumidifier.....somewhat

too high of humidity is a problem in flowering because of powdery mildew and mold bud rott etc....My veg is always very low in humidity 20-30% RH but they can accept much higher 60%+, but in a bloom room with as much transpiring as the plants do it is important to keep 40-50% RH... also have a fan circulating air.....

I have the complete opposite effect. My AC acts as a humidifier while my heater will act as a dehumidifier...???

Too low humidity and the plant sweats more than it can drink leading to deficiencies. Too high humidity the plant can't sweat at all and kinda drowns and heat stress. AC's act as a dehumidifier because the air is pulled through a grill that is cold. As the air gets colder it condenses together and the water in the air gets closer together which makes it heavier and it collects on the coil. Thus blowing cold dryer air that warms up to make even less water to air ratio.

Exactamoondo! ^^^^^^