Supplements: Available Unit upgrades include: Insulation Package (4-walls/Ceiling) $3,200.00 Mini Split HVAC Heating & Cooling $12,230.00 Interior wall pass thru (combining units)** $2,500.00 ** (may be slightly more if electrical in walls removed) If you purchase a unit, you can also lease yard space for storage or laydown. For example: $350 /mo for a 40x25 ... (Read more) Available Unit upgrades include: Insulation Package (4-walls/Ceiling) $3,200.00 Mini Split HVAC Heating & Cooling $12,230.00 Interior wall pass thru (combining units)** $2,500.00 ** (may be slightly more if electrical in walls removed) If you purchase a unit, you can also lease yard space for storage or laydown. For example: $350 /mo for a 40x25 (1,000 sq/ft) and $400 /mo for a 40x40 (1,600 sq/ft). Each unit is also available for lease at $550 per month with a minimum 6-month lease.