Some people say that it is more cost-effective to use boilers, while others say that it is more cost-effective to use air energy heat pumps. Which is more cost-effective?

Look at the place where you use air source heat pump, which is generally used in Jiangnan, that is, the temperature is generally above 0 degrees in winter. Because the air source heat pump has a characteristic, when the temperature is lower than -5℃, the air source heat pump will start the automatic defrosting function, which will seriously affect the heating effect and cause greater energy consumption. Therefore, the operating cost of air source heat pump is much higher than that of boiler in the north and lower in the south. But boilers can only provide heat, and heat pumps have two functions. Judging from your design ideas and considerations, the initial investment of heat pump is definitely less than that of boiler plus central air conditioning, but the operating cost and usage will vary from region to region, so weigh it yourself.