FAQ > Mobile Auto Glass Service Knoxville's Finest Auto Glass Installation Center • Why is it difficult for Phoenix Glass to set an exact appointment time for my mobile windshield replacement? Almost every auto glass company gives you a 4 hour window of the time that they will arrive at your location. If they don't it's  because you are the only one they are working for that day which should light a pretty bright light bulb in your mind.  In reality  a 4 hour window is about as precise as scheduling gets for an honest auto glass replacement company that offers mobile auto  glass service.  Mobile auto glass replacement is a service industry trade where a technician often encounters unexpected  situations not only with the vehicle involved but traffic and weather related items as well.  Some jobs are easy and some are  very difficult.  Some customers are easy and some have lots of questions.  Some insurance companies we do work for have  extensive before and after on site paperwork involved which can add quite a bit more time to a particular job.  At least once, if  not more, on a busy mobile auto glass technicians day a customer will cancel or not be there or may not answer their phone to  verify that they are there.  Many times while on site at a body shop our auto glass technicians will have an unplanned job  added which changes his or her entire daily job plan.  Please keep in mind that we aren't trying to make excuses here, we're  just being honest and pointing out some of the pitfalls in our average day so you can have an understanding of some of the  reasons why we can't tell you what you want to hear.  The reasons go on and on but the bottom line here is that the technician  will do his or her very best but some things are just not in their control.  • How long will it take to replace my windshield or other auto glass? What we would call a normal mobile auto glass installation usually takes from 30 to 90 minutes.  Installations that take longer  than 90 minutes are what we classify as difficult installations.  For obvious reasons it is not practical for us to do these types of  installations in the field so they do not qualify for our Mobile Service.  As a rule they require that the installation be performed  and monitored for a period of time in our facility.  Some of these types of installations are timely because they are done in  stages, some of which cannot be accomplished until the adhesive has cured for a certain amount of time.  Most vertical set windows such as pickup truck back glasses require being held in place by different  manners and for many reasons (paint damage being the main one) need to be done in and remain in  our repair centers controlled environment until the adhesive cures for a certain amount of time.  Most door glasses that operate in an up and down manner average 30 to 60 minutes to install and  you will be able to operate them immediately.  In the event that there is a urethane bonding system  involved you may not be able too operate your new window until the adhesive cures after a minimum of  24 hours.  There are many different types of vehicles out there in today’s world and each of them have their own peculiarities.  Your customer service representative at Phoenix Glass will be more than happy to answer any questions you may have for your  particular vehicle.  • Will you vacuum up the broken glass? Absolutely!  Don't touch that mess and risk getting cut.  We'll vacuum up your broken glass when we come out to do the job or  when we do it at our facility.  We do our best to make your vehicle the best we possibly can.  There are some door, back glass  replacement windows that need to and should be done in house at our Service Center due to the nature of the construction of  the vehicle.  One of the   problems is that the broken  glass gets caught on or   within the rails of the  vehicle's inner guard beam   and absolutely cannot be  removed without the use of   compressed air.  There are  also some doors that do not   have enough access holes  to the interior of the door to   allow a vacuum hose  through the range of the   entire door and once again  the only method of getting all   the broken glass out of the  door that is possible is with the use of compressed air.  Some hatch type back glass installations such as the GM vehicle  pictured above have an inner skeleton that fills with broken glass fragments and absolutely cannot be removed without the use  of compressed air.  Our Customer Service Representatives will do their best to advise you whether or not your vehicle can or  should be done mobile.  •  Is it ok to have my auto glass installed in cold weather?  The answer to your question varies greatly depending on the vehicle in question.  The standard adhesive curing time is greatly reduced during lower temperatures which can be overcome with the application of  a different (more expensive) urethane adhesive.  The main problem is that the majority of today’s vehicles contain several plastic components that become extremely delicate to  work with below 50F (10C).  One example of this would be a glass with an encapsulated molding that in cold weather would not  seat properly which would elevate the glass too high resulting in a poor seal (likely leak) and the very least cosmetic problems.  If conditions are too cold (below 50 degrees) at the available installation time for a safe and or sensible installation we will  advise you and suggest that your installation be done in our Service Center.