A Car Dehumidifier With No Battery Drain

A parked car is a sealed glass box that breathes. Wet floor mats, damp carpet underlay and a cracked door seal put moisture into the cabin; overnight temperature swings condense it onto the inside of the glass. That's the film you wipe off the windshield every winter morning — and the same moisture is sitting in the carpet, the seat foam and the seatbelt retractors.

Sta-Dri is a passive desiccant dehumidifier. No 12V draw, no plug in the cigarette lighter, nothing to flatten the battery on a car that sits.

• Daily drivers with foggy windows and damp carpet.
• Classics and project cars in long-term storage.
• Enclosed transport and overseas shipping.
• Trunk, glovebox, and under-seat spaces where rust starts out of sight.

Use 1 pound per 13.3 cubic feet of cabin volume. The chart below covers common body styles. For a car in long storage, add a pack in the trunk and one in the footwell of each row. To size it exactly, use the Sta-Dri calculator.

Condensation on the inside of the glass isn't a heater problem — it means there's more water in the cabin than the air can hold when it cools. Running the defroster clears the glass without removing the water, so it comes back the next cold night.

Find the source first: lift the mats and press the carpet with your palm, check the footwells for a blocked A/C drain or leaking heater core, and look at the door and windshield seals. Dry the carpet out, then leave a pack under a seat to hold the cabin dry. If the carpet soaks again in a week, you have a leak a desiccant can't fix.

Dealers, collections, and enclosed transporters order Sta-Dri in bulk. Tell us what you're storing and we'll work the quantity and pricing with you.