Quick Answer
Passive solar homes can minimize or eliminate the need for backup heating systems, but they often still require some form of supplementary heating on extremely cold days or nights.
Designing for Energy Efficiency
Passive solar homes are designed to harness the sun’s energy for heating in the winter and cooling in the summer. A well-designed south-facing glazing area of 10-20% of the home’s total floor area can provide sufficient heat gain to warm the home. The strategic placement of thermal mass elements, such as concrete or brick, can absorb and release heat as needed, further reducing the need for backup heating.
Minimizing Heat Loss
To maximize energy efficiency, passive solar homes often incorporate features such as overhangs, which can reduce summer heat gain while allowing winter sunlight to enter. A well-designed overhang can block direct sunlight during the summer months, preventing overheating and reducing the need for cooling. In addition, insulation and air sealing are crucial to minimizing heat loss and maintaining a comfortable indoor temperature.
Backup Heating Options
While a well-designed passive solar home can reduce the need for backup heating, it’s still essential to have some form of supplementary heating available for extremely cold days or nights. Options may include a small propane or electric heater, a wood-burning stove, or a solar water heater with a heat exchanger. The specific backup heating solution will depend on the home’s location, climate, and insulation levels. In general, a backup heating system should be designed to provide a small amount of heat, around 1-2 kW, to supplement the home’s natural heating.
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