xkcd #3099: Neighbor-Source Heat Pump
Title text:
The installation of the pipes on the inside of the insulation can be challenging, especially when the neighbor could come home at any minute.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3099/
Except for when the people below you are ancient and run the heater in the SUMMER..