New Hampshire home prices edged upward again in August after a slight dip in July, continuing to keep the housing market largely in favor of sellers. The median price for a single-family home reached $550,000 in August. As usual, Rockingham County topped the list as the most expensive area to buy a house last month, with a median price of $689,000. In Merrimack County, the median price was $527,500. At that time, the median price of a single-family home was $248,000.