Green retrofit, home energy retrofit, home retrofit, Deep energy retrofit and home performance retrofit are terms with overlapping meaning for retrofits that ensure the maintenance and preservation of buildings and the continued operation and maintenance of energy efficiency technologies. The meaning ranges from steps home owners can do themselves to buying up distressed properties and making them certifiably green. In the United States, the DOE issued a solicitation for $390 million for a "Retrofit Ramp-Up" program.
Steps home owners can do include the following:
- Insulation, primarily roof/ceiling/attic and secondary walls and floor
- Retrofitting heating equipments in older houses, results in house-hold savings of 30–80% due to cut in energy-use and a reduction of CO2-outlets by 30–100%.
- Thermostats in all rooms
- New windows.
- Plugging air leaks.
- Tuning up heating and cooling (HVAC) systems.
- Switching to compact fluorescent light bulbs and/or LED light bulbs
- Choosing appliances with low energy consumption. In the United States, this is certified by the Energy Star.
- Reducing water use by installing aerators and low-flow showerheads
- Switching to green power, including solar energy and renewables such as heating-pellets and bio-gas
- Using low-VOC products to improve indoor air quality
- Planting native plants and other appropriate landscaping measures.
- An old gas-boiler has an energy-efficiency of 65% and a new one 93% resulting in a 30% energy reduction and consequently a 30% CO2-reduction, if installing a wood-chips or pellets boiler the savings will be increased efficiency + cheaper fuel resulting in a total saving of 40–50% and a CO2-reduction of 100% (renewable energy), if installing an efficient heat-pump the savings and the reduction will both be around 80% (100% CO2 reduction if the electricity comes from renewable energy).
- Residential Sector: Designing a prescriptive whole house retrofit program, Michael Wheeler, California Public Utilities Commission
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