Install an Exhaust Fan
To increase the ventilation in a crawl space and lower humidity, consider installing a 1,000-cubic-foot-per-minute exhaust fan that removes excessive and unwanted moisture. This is not as difficult as it might seem if you mount the fan in an existing window. A carpenter will charge about $190 to build a plywood frame and install the fan, but you can do the job for $80 and save more than half that amount.

You'll need basic carpentry skills and tools, including a saber saw, electric drill, wrench and screwdriver. Pro vs DIY Cost and TimeIf you're not comfortable doing electrical work, you can build the frame and install the fan and then hire an electrician to hook it up.

Use a piece of 3/4-inch-thick plywood cut to fit into the window jamb to hold the fan in place. Paint the frame with a good quality exterior paint before you mount the fan. Then install the plywood panel in the window jamb and caulk around the window opening.

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