Standard furnaces provide efficient whole-home heating in cold environments, while underfloor heating excels in small rooms, so the two systems can work well together. Compared to supplementing a furnace with space heaters, underfloor heating probably provides superior efficiency.
Although they typically aren't quite as efficient as boilers, furnaces remain a top choice for heating homes in cold environments where heat pumps can't extract sufficient heat from the air outdoors. Newer underfloor heating solutions have been touted as providing superior efficiency, but larger rooms are often better heated using standard furnaces and boilers. For heating a bedroom, bathroom or kitchen, however, underfloor heating serve as a valuable source of supplemental heating that doesn't require installing a new furnace or using inefficient space or wall heaters.