From www.hvac-certification-exam-guide.com br br This practice exam may be helpful to study for these NATEICE certification test: Gas Furnace Installation (GS-IN), Gas Furnace Service (GS-SV), Hydronics Gas - Installation (HG-IN), Hydronics Gas Service (HG-SV), Hydronics Oil - Installation (HO-IN), Hydronics Oil Service (HO-SV) and ARI-ICE.