Humidity issue at night.

So I'm having a humidity issue during my night cycle and I'm not sure why...I'm running 1 idealair 190 pint commercial dehumidifier a 50 pint ideal air and one other. Night humidity ranges from 65-74 day time is fine at 48. Any input or suggestions would be appreciated. Also grow area is 800 sqft with 10ft ceilings.

Basically when the lights are on it hotter, making it easier for the water in the air to evaporate. When your lights shut off the heat drops allowing the air to hold more water.

Space heater will help fix that, have it turn on when lights turn off.

Around what temp

dubekoms said:

Basically when the lights are on it hotter, making it easier for the water in the air to evaporate. When your lights shut off the heat drops allowing the air to hold more water.

Click to expand...

Cold air holds less moisture than hot sir but if water content stays the same the relative humidity rises as temp drops. The electric heater will cause reletive humidity to go down as temp goes up but moisture content could be the same. Best way to lower moisture content is replace the air with drier air or dehum IMO. So bigger dehum or better ventilation if colder, drier air available.

growitsfun said:

So I'm having a humidity issue during my night cycle and I'm not sure why...I'm running 1 idealair 190 pint commercial dehumidifier a 50 pint ideal air and one other. Night humidity ranges from 65-74 day time is fine at 48. Any input or suggestions would be appreciated. Also grow area is 800 sqft with 10ft ceilings.

Click to expand...

must be a decent size space for 3 humidifier that size to not do the job

check and make sure your device is operating as is should
are they collecting a amount of water over night that males sense for the rating of the device?

budley said it right...the (bigger) dehumifiier is a better way to go over a space heater

trying to control humidity by adjusting temps up or down is likely a losing battle during lights out

the plants are transpiring and the vent fan or a/c is not running or cant reduce the humidity enough depending on ambient conditions and your set up

as a rule in an outdoor environment they temp/humididty rules apply to some degree, but in a closed room with a volume of plants youll not find that to be true

The 190 pint should be able to do a 2000 square foot house lol. Something is weird here.

That's a scary line to walk, those RH readings should be switched! A heater may help, obviously excessive air flow is key and in some scenarios removing fans leaves is an option.

190 pint = 23.75 gallons daily - but this is based on extreme conditions 80F+. Another trick to increasing the dehumidifiers ability is to get it up! Suspend it from the ceiling.

Monster Gardens said:

That's a scary line to walk, those RH readings should be switched! A heater may help, obviously excessive air flow is key and in some scenarios removing fans leaves is an option.

190 pint = 23.75 gallons daily - but this is based on extreme conditions 80F+. Another trick to increasing the dehumidifiers ability is to get it up! Suspend it from the ceiling.

Click to expand...

Even at 70f it should be well over 100 ppd so should be able to handle a large grow room, I would be suspect that the dehum is actually working properly. Way to many unknowns to offer any real helpful advice IMO, room size, plant count, type of grow. High humidity can cause issues with the actual structure as well as plant health so it's a good ideal to get an handle on it.