In this subtitle the following words have the meanings indicated. “Fund” means the Energy–Efficient Homes Construction Fund. “Low–energy home” means a home that achieves a Home Energy Rating System (HERS) Index rating: of 50 or lower; or as determined by the Department in regulations. “Net–zero home” means a home that is designed to produce an amount of energy in 1 year that is equal to the amount of energy that the home uses in 1 year. “Program” means the Energy–Efficient Homes Construction Loan Program.