I have 2 peace lilies inside and they are looking like they are wilting. I don't know what is wrong or how to spruce them back up. The house stays a constant 68 degrees. Could that be the reason? PLEASE HELP!!!

Your temps are fine. I just wonder about the watering. I've had mine for 14 yrs now, not much in the flowering department but it's healthy just the same. The soil should not be sopping wet or left to go completely dry for these guys, it should feel "slightly" on the moist side. The soil should drain well. Water well after the top couple inches have dried and don't them sit in the excess water. Keep them in small pots, it's so easy to overwater when plants are moved to overly large pots or have poor drainage. If the soil has been wet, make sure the roots are ok and let it dry out a little more, if dry, a real good soaking will help them recover quickly.
Also, keep these plants away from direct hot sun, they like indirect light, some morning sun is ok.