Don’t bothering tuning when your guitar when you first set it up. Play it a little first and let it sit for awhile to acclimate to the room temperature. A lot of times, if it’s sharp or flat when you first check it, it’ll come back to A 440.
Beer, OTOH, shouldn’t be drunk at room temperature, A 440 or not. It takes a certain amount of time to get a beer cold in a fridge or in a cooler, according to Fourier’s law and the conductivity of aluminum, but if you’re in a hurry you can lay a hot can of beer on some ice and spin it with your finger. In 2 minutes you’ll be ready for the first set with a cold beer.