1, Cheaper Bills
Although the installation costs are higher, the long term savings far outweigh this. The maintenance costs are much lower too, almost non-existent.
2, Consistent heat all year around
Air Source Heat Pumps can convert air from as low as -20c. They can also be used as air-conditioning.
3, Lower carbon footprint
Adapting to clean energy now meaning you are reducing one of the larger contributions to carbon emissions. There are also a schemes/grants available at the moment to encourage this.
4. Long Lasting
Air source heat pumps last up to 20 years with little or no maintenance. This longevity means less overall spend.