Stewart Signs adds 3M film claimed to cut cabin heat by up to 5.5°C

Stewart Signs has added 3M™ Cooling Film to its lineup, a film aimed at keeping vehicle interiors cooler without drawing any power, according to Stewart Signs. For fleets running vans and trucks through summer months, that matters for driver comfort, refrigeration load and anything sensitive to cabin heat.

Treat the claimed numbers, which come from 3M, as a starting point for questions, not gospel: the film reflects more than 85% of incoming solar energy, can cut interior temperatures by up to 5.5°C, and keeps roof surfaces up to 16.6°C cooler, with thermal emissivity above 91% and no need for extra power once fitted. Stewart Signs pitches it across fleet, rail and marine applications, and is positioning itself as a 3M Platinum Partner offering professional fitting alongside 3M's top-tier warranty.

Why this matters: Passive cooling that needs no wiring or battery draw is an easy add to livery or wrap jobs already booked in, and could shave cooling-system strain on hot routes or idle-heavy depots. Worth asking Stewart Signs directly, via enquiries@stewartsigns.co.uk, how the warranty terms and installation timeline stack up against your existing wrap and SMR schedule before committing a whole van.