Installation costs ARE COVERED for:

HVAC (Heating, Ventilation and Air Conditioning) systems
Biomass Stoves
Water Heaters (including solar)
Solar Panels
Geothermal Heat Pumps
Wind Energy Systems
Fuel Cells
The tax credit for HVAC, biomass stoves, and non-solar water heaters is 30% of the total cost (product + installation) up to $1,500. The law specifies installation costs include: "expenditures for labor costs properly allocable to the onsite preparation, assembly, or original installation of the property."

The tax credit for solar water heaters, solar panels, geothermal heat pumps, wind energy systems, and fuel cells* is 30% of the total cost (product + installation), with no upper limit. The law specifies installation costs include: "labor costs properly allocable to the onsite preparation, assembly, or original installation of the property and for piping or wiring to interconnect such property to the home."