Florida's heat and humidity are the biggest threat to piano longevity. This is what you need to know — written by a technician who tunes pianos across Martin County and the Treasure Coast.
Florida's relative humidity swings between 40% in dry winter months and 85%+ during summer. Pianos are built from wood. Wood moves with moisture — and that movement has consequences.
The core problem: The soundboard — a large spruce panel that amplifies string vibration — expands in humidity and contracts in dry air. As it rises and falls, it changes the tension on every string simultaneously, pulling the entire piano out of tune. Over years, this repeated stress cracks the soundboard, fails glue joints, and warps the wooden action parts that control every key.
In summer humidity, the soundboard crowns upward, increasing string tension — the piano goes sharp. In dry winter air, it flattens and strings go flat. The result: a piano that's never quite in tune, no matter how recently it was serviced.
The action — the mechanical assembly connecting keys to hammers — is made of wood, leather, and felt. Florida humidity causes these materials to swell, changing touch weight, response, and consistency. Keys that felt light in January may feel heavy and sluggish by August.
Hide glue — the standard for piano woodwork — softens in humidity. Repeated swelling cycles stress glue joints in the soundboard, bridges, and pin block. This is the slow damage that turns a repairable problem into an expensive rebuild.
Wooden key frames and action components swell in high humidity, causing keys to stick, notes to not repeat cleanly, or dampers to not return to position. This is rarely a mechanical failure — it's moisture. Proper humidity control eliminates it.
The standard recommendation is twice a year. Florida demands it.
Tuning is maintenance. Climate control is protection. The two work together.
These symptoms mean the piano is telling you something. Don't wait for the annual tuning.
Sticking keys Keys that don't return after being pressed, or feel heavy and sluggish
Buzzing strings A buzzing or rattling sound on certain notes — often a loose sympathetic vibration from a cracked component
Dull or muffled tone Hammers harden with age and use; a dull, thudding tone usually means they need voicing or replacement
Uneven sound across the keyboard Some notes loud, others thin — regulation or voicing needed
Notes that don't repeat Pressing a key quickly and having it not respond — action is sluggish and needs regulation
Audible pitch drift If the piano sounds "off" to your ear between tunings — Florida humidity is working on it faster than your schedule
The questions I get most often from Martin County piano owners.
Florida's climate won't slow down. Schedule your tuning now — most appointments confirmed within 24 hours.
Questions? Email sitnsmusic@gmail.com