It varies considerably, depending on the size of the building and the type of system.

As a rough guide, smaller buildings of 10 to 20 lots might be looking at $10,000 to $25,000 for a common-area system. Mid-sized buildings fall into the $30,000 to $80,000 range. Larger complexes can exceed $100,000.

Those figures are before any rebates or grant funding, which can significantly reduce what the Owners Corporation actually pays.