For 120 square feet, you're going to need between 12 and 24 pints of capacity.
The easiest way to find out what size dehumidifier you need is to use this free dehumidifier sizing calculator: http://www.homedehumidifierpints.com/
If you're looking for a particular dehumidifier that fits your 120 foot room, this Frigidaire at Amazon.com will be one of the best deals on the net, 40% off and free shipping (see link below in related links).
-Footnote- A pint refers to removing 1 pint of moisture per 24 hours in a standard humidity and at a standard temperature. Pints of capacity are the standard measurement for comparing dehumidifiers.
188 will cover it. Bring extra.
A 12x12 tile covers 1 square foot (since 12 inches = 1 foot). To cover a 144 square foot area, you would need 144 tiles, as each tile covers 1 square foot. Therefore, you need a total of 144 tiles to completely cover the area.
You will need a minimum of 16 square feet of carpet to cover that area.
It depends on how many square feet one is trying to de-humidify. The bigger the unit, the greater area they will control.
To cover this area you will need about 10.87 square meters of material.
Only water should be put into a dehumidifier. If you try to add anything else to it, you might end up ruining the dehumidifier.
Half a cubic foot.
Depends on how large and damp your crawlspace is! Enter the type of room (or square footage) into a dehumidifier calculator (like the one in Related Links below) and it reveals not only how many pints of capacity you need, but which dehumidifiers fit your needs.
12 inches = 1 foot Thus the tiles would be 1 foot square. You therefore need 30 to cover a 30 square foot room.
It depends on the size of the tiles and also, to some extent, on the shape of the area that you need to cover.
To cover an 81 square foot area, you first need to convert the dimensions of the 12x12 blocks to square feet. Each 12x12 block is 1 square foot (since 12 inches = 1 foot). Therefore, you would need 81 blocks to cover the 81 square foot space.
Roughly 22 square yards.