How does Florida humidity affect furniture?

Key points

• • 45–55% indoor RH is the target range for wood and upholstery alike
• • Air conditioning dries leather faster than humidity damages it
• • Piece-dyed fabric near a west-facing slider fades within a couple of seasons
• • Closed seasonal homes are where nearly all mildew damage happens

What humidity does to wood

Wood absorbs and releases moisture with the air around it. Wide solid tops expand and contract most, which is why a dining table can develop a hairline separation after a summer with the air off. Engineered panels are dimensionally stable, but if water reaches a particleboard core the swelling is permanent.

What it does to upholstery

Foam and fiber hold moisture. In a closed room, that supports mildew and the musty odor that returns after cleaning. Airflow matters as much as the material: pulling upholstery a few inches off exterior walls and running the air handler on a humidity setpoint prevents most of it.

• • Cover with breathable cotton, never plastic sheeting
• • Strip and air cushions occasionally in guest rooms
• • Run the system on a dehumidification schedule rather than off

Sun and salt

Florida light fades piece-dyed fabric, dries leather and yellows some finishes. Solution-dyed acrylics carry color through the fiber and resist it. Near the coast, salt residue accelerates corrosion on untreated metal — powder-coated aluminum and teak are the reliable outdoor choices.

Seasonal closure checklist

Before leaving for the season, set the air handler to hold humidity rather than switching it off, close blinds on sun-facing windows, pull furniture off exterior walls, cover with breathable fabric, and remove anything organic from drawers and cushions.