Heating will continue to become ever more expensive and everyone should be looking a longterm solutions /methods of holding and keeping energy costs under control.
Most Parrots can withstand a fairly wide band of temperature. But if your temperature changes fairly rapidly, that can be a problem. The normal temperatures in the natural range of your Parrot can provide you a good idea of what they can comfortably handle. Understand that rapid changes is a problem as can drafts.