Dust the coils!

“Clean the evaporator and condenser coils on heat pumps, air-conditioners, or chillers. Dirty coils inhibit heat transfer; keeping coils clean saves energy.”

https://www.energystar.gov/buildings/facility-owners-and-managers/existing-buildings/save-energy/stamp-out-energy-waste?fbclid=IwAR2zKzJ09tI1BG-aavV9iulWQAEIExqLM9hMLFrmfAncX3xk0OyKkp_ns5g