Multifamily homes include partially-detached homes, townhouses, and apartment buildings and range from small units of less than four units to high-rises or apartment complexes with hundreds of units.

Residents may own or rent the unit they occupy. The opportunities and challenges to improving energy efficiency in multifamily housing differ from the issues in single-family housing and largely stem from differences in the types of appliances/equipment used and the split incentives common in rental properties or buildings with shared space and shared decision-making.

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