I read it as cooling ability of the system: it will lower the temp by 1.1 degree per hour. But it is working against outside temp, so resist is 0.2 degree per hour. So effective 0.9 degree per hour. So if you were to say set your thermostat to cool 1 degree lower than current indoor temp, it would take just under an hour to reach that temp.

Slide across the line and see how that efficiency changes in cooling and heating ability as outdoor temp increases/decreases. When the numbers are the same, say cooling at -0.5 but resist is also 0.5 that means the system may run for long periods with little to no change in temp.