Air to Air Heat Pump Operation - Constant or Timed?

[mike2016]

I've a split Air to Air Heat Pump system to heat my house. There's a header in each bedroom and one for the open plan living/dining area. I've had the unit on a timer for an hour in the morning for the open plan area only and I'll sometimes top up my bedroom in the morning when I'm working from home. I top up the heat for 1-2 hours in the evening manually in the open plan room. I'm not heating the upstairs currently and am still finishing the internal house so there's an open internal window to the open plan area to contend with still which loses heat to the landing/hallway and upstairs although I keep those doors closed which helps. 

 

This is the open plan area: 

Same Space - Longer Period:

My Bedroom:

 

Just wanted to ask should I be running the A2A more like underfloor and leave it set to 21/22 & on constantly or just on a timer? I'm treating it like a gas boiler at the moment!! I've a separate hot water heat pump cylinder I leave on all the time so it's always @ 55oC so hot water isn't a factor with the space heating.

 

Interested in advice / ideas / experiences others have with a similar system? Thanks. 

[JohnMo]

your temperature swings look uncomfortable to me. I doubt the large swings in temperature save you much either. You may find it more comfortable setting the high temperature lower - say 19 to 20 and small set back to say 18, this will allow the fabric of the building to get warmer, heat pump have to work less hard. The work cycle will be a small increase in room temp and then tick away, rather than balls out switch it off, balls out repeat.

 

I would try different things while monitoring outside and room temp, but also electric consumption.