Not sure about that. They are vacant until an election can be held

The Constitution requires that member of the House be replaced only by an election held in the congressional district of the former representative. "When vacancies happen in the Representation from any State, the Executive Authority thereof shall issue Writs of Election to fill such Vacancies." -- Article I, Section 2, Clause 4 of the U.S. Constitution According to the US Constitution and state law, the governor of the state calls for a special election to replace the vacant House seat. The full election-cycle must be followed including political party nominating processes, primary elections and a general election, all held in the congressional district involved. The entire process often takes as long as from three to six months. While a House seat is vacant, the office of the former representative remains open, its staff operating under the supervision of the Clerk of the House of Representatives. The people of the affected congressional district do not have voting representation in the House during the vacancy period. They can, however, continue to contact former representative's interim office for assistance with a limited range of services as listed below by the Clerk of the House.