A measure that would incentivize the installation of ground geothermal systems, heating pumps and heat batteries — shaving 10 percent off the upfront cost of installation, the most expensive part of the technology — has been introduced in the Connecticut General Assembly. A heat pump is basically the same technology as a refrigerator. A refrigerator pumps thermal energy out of the inside of the fridge, creating a cool area inside while filling the kitchen with warm air. If you stand next to a running refrigerator you should be able to notice this warming. This is the same way an air conditioner works too; it pumps heat out of a room into the environment. By attaching the heat pump to the geothermal pipes, you can effectively suck heat out of the Earth and use it to warm your home. In the summer, the process is reversed, sucking the heat out of your home and pumping it into the ground. This effectively uses the Earth as a heating and cooling battery. Natural gas prices have spiked recently due to increased demand for heating and electricity regionally, which has made electricity prices volatile. Ground geothermal is a critical part of reducing demand on the grid.
https://www.stamfordadvocate.com/news/article/ct-legislature-ground-geothermal-energy-affordable-17837118.php?src=sthplocal