I read that hedgehogs need to live in 73-85 degree weather. My house right now is 71 degrees, but is probably a little less than that. So should i turn up the heat or put a space heater on him temporarily and look into buying some alternate heating source? At 71, you should be good for a young and healthy hedgehog. If it gets cooler, your hedgehog might start getting sluggish and try going into a false hibernation. I have a space heater in my hedgehog room, but that really isn't an economical solution for 1 hedgehog.
What I recommend is picking up a small reptile heating pad at your local pet store. Paste it to the bottom underside corner of the cage. if your hedgehog is cold, he can go to the pad, if not he can move off it.
I've used the reptile heating pads for the better part of 13 yrs and have never had a problem with them. They don't get hot enough to melt the cage or burn your hedgehogs or anything like that. Just make sure you follow the directions on the package and use the little spacer feet to allow air flow under the heater. Do not put the cage down on carpeting because it may press against the heating pag and cause it to over heat.
On the other hand, I did manage to melt the side of a cage with a heating light........