Assuming that the warehouse is a cuboid with flat walls and that the storage shelves also need to be heated, then:
3 ft = 1 yd
volume = 200 ft × 400 ft × 20 ft
= (200 ÷ 3) yd × (400 ÷ 3) yd × (20 ÷ 3) yd
= 1600000/27 cu yd
= 59,259 7/27 cu yd
≈ 59,259 cu yards
(at that size, the fraction is immaterial; it is also reasonable to round to the nearest 10 cu yd to give approx 59,260 cu yd.)
Approx 59259 cubic yards.
A litre or cubic metre.
liters
The units are incompatible. A litre measures volume a hectare measures area.
liters * * * * * Actually, it is the cubic metre.
"m cubed" is meters cubed or cubic meters (always abbreviated m3). It is a unit of volume.
It is best to have the measurement of cubic feet of space of the area to be heated. This is the length of the space times the width of the space times the height. It takes far more to heat a 10 x 12 bedroom with 8 foot ceilings than it does to heat a warehouse that is 250 feet square with 16 foot ceilings, so be accurate with the measurements. You will also want to inform the rental business of the type of space: residential, commercial, a pole barn, temporary construction trailer, etc.
960 cubic feet
840 square feet don't think the height of the ceilings helps unless you are looking for cubic feet which would be 7560 cubic feet
You don't. Metre measures length, cubic metre measures volume.
a cubic meter measures volume. (ex. how much water in a cylinder.)
Cubic miles measures volume. Square miles measures area. Therefore, you can not compare the two.
No, it is not. A gram measures mass (like ounces or pounds), and a cubic centimeter measures volume (like cubic inches or quarts). They do not measure the same kind of value.
cubic measures such as cubic feet, cubic meters
Both cubic meters and liters are measures of volume.
cubic metres measures volume, square metres measures area. These are two completely different things.
There are no linear feet in a cubic yard as they are different units of measurement. A linear foot measures length, while a cubic yard measures volume.
3 dimensional objects.