How much improvement did tinting roof make? And overall you did clear on the factory tinted with added heat rejection? I have been debating that, especially the roof.
TINT: The Driver and Passenger windows ARE factory tinted. You can run your fingers at the edge of the window and you can feel there's a "layer". Where else the sunroof, passenger windows and rear are only what's called "Privacy screen", there's min to no heat rejection back there in some cases. The front shield has UV protection already so no worries.
1) I went ahead to apply a "clear" tint on the Front shield, that's 75% heat rejection - about 2 hours
2) Followed by the rest of the passenger windows and rear with the highest heat rejection (Brand used: XPEL) nano ceramic at 98% heat rejection
3) NOW...... I had initially left the Driver & Passenger window factory tinted, BUT I did notice a difference when i put my hand on/close to the window between the Factory tint and the new applied ones at 98%. So immediately, I made another appointment to get them replaced with the 98% as well. In order to do this, they will first remove the factory tint layer, then apply the new ones.
HEAT: The reality is no matter what, when a Car is baked out there for hours, it WILL get hot regardless what you put on. The main differences are:
1) It is indeed STILL cooler when higher heat rejection tints are utilized
2) Because it's cooler, it takes NO time to cool off the vehicle
Example: Since the tints, even though its been clocking
min > 105 outside temp, but I pre-cool the car through VOC about 15 mins before I actually step into the car., by time I enter the Car, it's already "comfortable" inside. BEFORE, my Audi had regular factory tints and no pre-cooling.... when I step into the car, I would literally be sweating already and with AC cranked up, it's still blowing HOT air for the next 5 miles. I'm esctatic to say I no longer have this issue.
3) Especially when you're driving, say long traffic light or stuck at traffic with the sun beating down on you, the 98% heat rejection is when you absolutely feel the difference - it's almost cool to the touch
I take my fury baby with me often in the Car, so that's one of the reasons I need it to be comfortable for him. And, I'm super prone to migraine in heat and humidity...so for those reasons, hands down a great investment overall.
Hope it helps!