In short, fermenting in your house.
As the post before me said, what yeast?
Most of the time I like to use WLP001 when fermenting an IPA. This yeast's optimal ferment temp is 68-73°F (20-23°C). Thats WhiteLab's recommendation on their website. If you're using that, I wouldn't put it in your garage because 55°F would be too cold for the yeast. Your house temp seems ideal. I ferment mine in the basement around 65°F. I've read some people place their fermenter in a larger tub with water to help keep temp constant, or add ice to the tub, getting it to cool down for cold crashing purposes.
If your feeling ambitious, split your brew and test out half in each location!