Nowadays air conditioners support heating function.
Electricity fee is cheaper than gas in winter.
If you use it with a boiler, you can feel summer.
Please warmly through heating solution.
https://www.youtube.com/watch?v=76HLar39t7c&index=1&list=PLBtp_AFLHDXFgLY960Hl7p6Byw2d9AThr