Quote:
Originally Posted by eyc234
It is the return air area for your a/c. Pull out your filter and you can look down in the area. Ours is fully insulated with insulation. Not sure about yours but just take out the filter and see if the bottom is open. Do not think in this case it would be wise to open up and use for storage.
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That is correct for the HVAC system. But, you may have empty space under the water heater. In my house, there is a drain line under the water heater to drain the leakage pan under the water heater, so no usable space.