Well, room temperature isn't really that important- it's the temperature of the fermenting wort that should be within those guidelines. Do you have a stick on thermometer on the fermenter? An aquarium stick on thermometer works well.
Sometimes the temperature of the fermenting wort is as much as 8 degrees higher than room temperature, because the fermentation itself puts out some heat. Still, 74 isn't so bad. You should be ok.
I always try to stay at the bottom range of the temperature guidelines, myself. It seems to be a little easier to keep it in the desired range and prevent any heat-related off-flavors.
Broken Leg Brewery
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