Historical and stylistic architecture is a city’s history cultural information that can’t reborn and precious wealth of the city. But they suffered destroy of different degree, badly influence themselves’ value. So protection and reconstruction is unavoidable. Taking the project of a certain building for an example， this paper made a comparison between the gas heat pump (GHP) and the air-source heat pump. It turns out that the GHP is more energy saving and environment protection， but larger initial cost . Finally ， through numerical simulation and measurement analysis ， the rationality of the transformation was explicated.