What's more economical and efficient all round, fitting a reverse cycle airconditioning unit or oil heaters?

What area is this in because it can really make a difference.

It's to heat up the entire house - 3 bedrooms, kitchen/family room area, dining and lounge.

It's to heat up the entire house - 3 bedrooms, kitchen/family room area, dining and lounge.

Location?? And average winter temp?

CBoM - Canberra Climate (http://www.bom.gov.au/weather/nsw/canberra/climate.shtml)
...Canberra winters are cool to cold with generally westerly winds. However winter is also a time when Canberra can experience clear, sunny days with light winds and a considerable number of frosts can occur. The mean daily maximum for July, the coldest month, is 11.2 °C while the mean daily minimum is −0.2 °C. Overall there is an average of 99 frosts for the year with an average of 95 frosts occurring between April and October with an average of 58 of these frosts occurring during the winter. Winter is also a period of considerable fog activity. There is an average of 44 fogs per year in Canberra with an average of 36 fogs occurring between April and September.


The ducted gas heating broke down a few days ago and I've decided not to have it fixed since it's normally the biggest household bill - gets massively expensive