About five or six cars a week are having damaged windscreens replaced at an Orange business as a result of cold nights and mornings.
Orange Auto Glass owner Darren Davis said among the problems were stone chips causing pre-existing weakness and people putting hot water on cold glass.
"Usually ones that are stone chipped they have a point to crack from and they will go to an edge," Mr Davis said.
"If you've got a stone chip and water gets inside it the water expands it."
Whenever possible Mr Davis suggested parking a car undercover or throwing a blanket over the windscreen.
"Sometimes it cannot be helped," Mr Davis said.
He said people should not use ice scrapers, which could scratch the glass, and heaters could have the same effect as hot water, so instead people should pour room-temperature water on the windscreen.
"If you get a stone chip put a stone chip protective sticker over it, or even sticky tape, as fast as you can, it stops any moisture getting in it."
He said people should then get the stone chip repaired as soon as possible other wise it could cost between about $330 and a couple of thousand dollars for windscreens to be replaced.
DO YOU WANT MORE ORANGE NEWS?
- Receive our free newsletters delivered to your inbox, as well as breaking news alerts. Sign up below ...