I need to lower RH, how big of dehumidifier do i need

so my room is roughly 5'x5'x7' . the last couple nights my temps go from 73-75 with a RH of 45-50% to a low of 63 with high RH of 88%. I am not sure if this is an easily answered question. any ideas or suggestions on how i can fix this problem. is it normal to have to run a dehumidifier?

sealed room?

nope not completely sealed, i guess that would be a big factor. my tent is in a room about 12x12x7. i have a pvc frame with panda film then surrounded by felt sheets its sealed to light but air can pass between the layers of panda film and felt sheet that is my door for now.

Atleast a 40 pint. Try to correlate your dehumidifer size with how much water your plants drink a day. They transpire according, which raises the humidity.

Depends on your environment inside and outside, if its normal. Even if you can manage it with fans, its nice to have a 70 pint box store unit on standby.

- Jiji

I would use a 40 pint minimum up to a 60 pint max , there are other important issues to consider when selecting the model of dehumidifier , 1st & most importantly is you want a cold temp model , all dehumidifiers work best the higher the room temp is & are less effective as temps go below 75 degrees , as room temps near 70 the dehumidifier takes longer to bring humidity levels down , make sure its a low temp model rated for 60 degree temps or lower .

You also want to consider waste water disposal when selecting a unit , some models have water collection buckets as well as a water disposal fitting you can screw a garden hose to & run direct to a drain , some models only have the collection bucket & once full the machine shuts off until you manually empty the bucket , in warmer temps the bucket will fill in a few hours then humidity runs right back up , the constant drip to drain hose will allow for 24 hr operation & goes into standby mode once desired setting is reached .

Expect to spend between $179 to $249 for a quality unit with low temp range , drip line & high pint capacity .

thanks for the detailed response. I would have overlooked the low temp thing. It seems to jump at night when the temps drop

Did you eliminate the option of installing a vent? What is your outdoor climate like? If cold you have a bunch of options.

Aviar said:

It seems to jump at night when the temps drop

Click to expand...

This is because your measuring Relative Humidity. If the temp lowers, its water holding capacity also lowers.

A dehumidifier will also slightly raise temps, helping your RH.

- Jiji

I had a 8x12 sealed room and water dripping off my walls when I first started out...literally water was dripping off the walls, I bought a 40pint energy saver dehumidifier on craigslist for $100 and I could get the room down to a rh of 35 if I wanted to. 40pint is all you need, also if you get a model with a continuous drain option you can drain it into a bucket and use that water.... regardless if you want to use the water or not I would get a continuous drain model, I had 5 gallon bucket under mine and it would completely fill up that bucket sometimes in day, without continuous drain you would have to empty the dehumidifier few times a day which would be a huge pain in the ass

i vote for a smaller one. its a small space, big ole 70 pts cost way more to run. i say 50.