Accidentally left out for 4 hours

Hello, I was being a bit cloudy-minded and off the ball today and accidentally left Tip's Humulin N out of the fridge for about 4 hours. What should I look for in the bottle to see if it's still good? Where would be a fairly cheap place to get it if it's toast? What symptoms should I look for if I won't be able to find anything in the vial to make sure it's still fine?

Also, it still felt kinda' cold when I moved it to the fridge. It was kept where I test and give her the insulin, which is kind of on the cold side for rooms(about 65-70 degrees F), and there's one small window that's always closed. Does this make it okay that it was left out? Should I not risk it? She'll likely need her insulin tomorrow morning and I have work to where I won't be able to get her more until past when she needs it in the morning.