- Make sure your system is installed by professionals who are licensed in California with no Contractor State License Board sanctions, and accredited by, and follow procedures established by, the International Ground Source Heat Pump Association (IGSHPA).
- Ask contractor for references of GeoExchange systems they have previously installed. Visit or call these references to ask about their experience and obtain recommendations.
- Expect a site evaluation so your contractor can make the best recommendation. This should include checking ducts, insulation and other features for building heat loss, including heat loss calculations from Manual J Wright, or similar.
- Get a narrative description of the system design and mechanics, including a plot plan of borefield or horizontal loop trenching with pipe and depth information.
- Get written cost estimates from 2 or 3 contractors. Ask for a breakdown between equipment and labor and get clarification on any questions.
- Get a written contract (including all terms, costs and start-stop dates) and a copy of the warranty (on the system and the installation). Be sure to ask for an owner’s manual.
- Require an inspection/verification measurement of bores (after grouting) or trenches before covering.
Call Plumas-Sierra Rural Electric Cooperative if you have any other questions or concerns.