There are almost 250,000 rental homes and apartments in central Ohio. More than 35,000 are occupied by those who need a little help financially. Residents in those 35,000 rentals receive the two most common forms of federal housing support: Section 42 credits, which indirectly subsidize rent by underwriting apartment construction; and the much older Section 8 program, which directly subsidizes rent. Affordable housing is also, surprisingly in this partisan age, largely uncontroversial, as Tom Feusse knows. “This is such a small slice of the federal budget that it receives wide support,” said Feusse, the CEO of Wallick Cos., which made its name in affordable housing. Recently he took time to offer a primer on affordable housing and to clear up what he fears are misperceptions about the occupants.