Get it fixed ASAP. With the big change in temps between day and night it can easily run. Avoid using the defrost, if possible, until it is fixed. Don't know where you live, but I charge $40.00 for the first 3 chips. I can't (yet) fix cracks over about an inch, but some windshield tech's fix up to 24". If you have full coverage, or comp w/glass your insurance should cover it with no deductable.