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1 A 5x5 foot storage unit usually runs about $40-$50 per month. 2  10x15 foot units cost $75-$140 per month or $115-$150 for a climate controlled space. 3  A 10x20 unit ranges from $95-$155 per month or $170-$180 for climate controlled. 4  20x20-foot spaces rent for about $225 per month.
Average climate controlled storage unit costs go up by about $25 to $30 per month over non-climate controlled units. A fully loaded, 10ft x 30ft climate controlled will cost as much as $350 per month. A smaller, 5ft x 10ft unit with all the options will cost between $120 and $175 per month.he price of a storage unit depends on the size of the unit and the options. Climate control, electricity, and ventilation are just a few of the options that can increase the price. Storage units typically come in sizes: 1  5ft x 10ft. 2  10ft x 10ft. 3  10ft x 15ft.