Thanks to everyone – in true Geekzone fashion so many posters are coming in with great advice.
Timmmay, Jase and Hammerera – thanks for fully explaining the benefits of running the heat pump when it will be most efficient. This is invaluable info and we’ll put it into practice.
Bfginger – I expect you’re right about sending air into the flat from the ceiling, particularly as asthma is an issue. Thanks for the link to the Daikin portable, that is a good possibility if we choose to go with a small unit.
Once again, many thanks
PS: We’ll be away over the next couple of weeks so replies may be sporadic, depending on where we can get internet access – but we’ll check back as often as possible for further contributions :-)