Power vent heater vent out the side of the house, similar to a dryer vent. Power vent heaters cost quite a bit more than standard vent models, so that might be a consideration. If you decide to go with a standard vent model, then putting that vent in now would be very wise. If you don't put it in now, it could still be done later, but not as easily. A power vent is quite easy to vent as they use 2" PVC. Research the pros and cons of both types of heaters, then decide which way seems right of you.