Solar central air heating:

This uncomplicated solar system uses a radiator type fan coil that fits into the home's central duct, which is connected to the solar storage tank with plumbing lines and a pump. A control directs the home thermostat to start the small solar pump and furnace fan to carry the heat into the house. The solar storage tank can also be plumbed to provide hot water on a year-round basis for greatest cost-effectiveness.

Solar room heating:

These extended solar hot water systems can heat individual spaces such as bathrooms, kitchens, bedrooms, without the wasteful use of a central furnace when only local heat is needed. Use these simple systems in the mornings and evenings year-round in cool coastal areas, or early or late in the winter when the whole house does not need heat.

-- Tips courtesy of HomeAdvisor.com