# Geothermal direct use and ground-source heat pumps and High-density polyethylene

Their prices have moved together.

Source page: https://www.materialinsights.org/links/geothermal-direct-use-and-ground-source-heat-pumps-and-high-density-polyethylene/

[Geothermal direct use and ground-source heat pumps](https://www.materialinsights.org/energy/e_geo_direct/) (energy) and [High-density polyethylene](https://www.materialinsights.org/chemicals/hdpe/) (chemical): 1 relationship.

## How they are linked

### 1. Price link: loop input

*Cost and price · Weak · Both ways*

Ground loops are long runs of HDPE pipe buried in trenches or boreholes. The resin proxy and heat pump index show a weak link, with yearly changes correlating at 0.23.

- **0.04** monthly change correlation
- **0.23** 12-month change correlation
- **0.70** fitted elasticity

Built from the site data on production routes, energy flows, industry value chains, input-output tables and prices.