Multi-Family Development in Central CA. Q about Heat Pumps

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Hi all,

Working on a project in Central CA and have the option to avoid bringing natural gas on-site if we use heat pumps for water heating and space conditioning. The on-demand units need less space, but require more annual maintenance in order to avoid them calcifying. The heat pump units require more space, but there would likely be a savings in the range of $500k for the project. About 200 units here.

I am trying to figure out how to quantify if the annual maintenance would be more efficient then bringing natural gas on-site.

Cheers!