There is no outright model for a farmhouse, however the greater part of us can remember one when we see it. By definition the firsts were situated on ranches and were essential to the life and work of those homestead families who lived there.
Contingent upon when and where those homes were manufactured, they could be made of stone, block, shingles or clapboard. Most farmhouses had yards since there was no cooling and many ranch and family tasks were embraced there. The patio rooftop gave cover from the sun and downpour yet enabled the cool winds to course through and help make those hot summers average.