A bill to extend from five to eight years the program which was established by section 6 of the Solar Heating and Cooling Demonstration Act of 1974 (and the authority to conduct related activities under that Act) for the development and demonstration of combined solar heating and cooling systems.

Amends the Solar Heating and Cooling Demonstration Act of 1974 by extending from five to eight years the time allotted for the development and demonstration of combined solar heating and cooling systems.

Requires the Secretary of Energy and the Secretary of Housing and Urban Development to make the necessary modifications in the comprehensive program plan required by the Act and to submit such modifications to the President and Congress within 120 days of the enactment of this Act.