"RemiRemi" wrote in message
...
My next door neighbour is considering installing geo-thermal heating and
cooling using a heat pump 20-25 feet away from my deck. Should I be
concerned about the noise? I like things quiet. Any thought? Thanks.

The outside equipment are tubes with working fluid (like antifreeze) running
through them, buried deeply underground where the temperature is a constant
55 F all year. The fluid pumps summer heat into the ground, and extracts
winter heat from the ground into the house. Fluid running through tubes
buried deeply will not have surface noise.

Once the job is complete, you will have no effect.

However, be aware they will probably dig a vertical channel rather than
horizontal, which means they will be digging a very deep channel into your
neighbor's property, many feet deep. The digging will probably be noisy and
may take a couple of days. It will also be unsightly until the hole is
refilled and cleaned up.

Once done, you won't know it's there.