For 29 years we used thermostatically controlled storage heaters and since our bungalow is airtight and very well insulated, the running costs of storage heating was reasonable.
However, in 2018, we removed all the storage heaters and had a 7.5kW air-sourced heat pump fitted driving two ceiling cassettes and a wall unit.
We used this system for the 2018-19 winter with two ceiling cassettes in the main hall, but they were not quite sufficient to heat our bungalow.
So, in 2019, we had an additional 5kW air-sourced heat pump fitted to heat and cool the lounge and provide additional heating to the bedroom area.
We had tried a stand-alone portable air-conditioner, but it was incredibly noisy and needed a huge snakey hose.