One of the advantages of owning a thermal camera is that you can inspect HVAC systems whenever you like! The mini-split heat pumps I work with provide a great example and so far this one shows no significant degradation in efficiency.

The left image shows the view of the evaporator from inside the building at 76 °F ambient, with minimum temperature of 64 °F. The right image shows the view of the condenser from outside the building at 87 °F ambient, with a maximum temperature of 106 °F. Pretty sweet device!