CFR > Title 24 - Housing and Urban Development > SUBTITLE B—Regulations Relating to Housing and Urban Development > CHAPTER II—OFFICE OF ASSISTANT SECRETARY FOR HOUSING—FEDERAL HOUSING COMMISSIONER, DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT (parts 200 to 291) > SUBCHAPTER B—MORTGAGE AND LOAN INSURANCE PROGRAMS UNDER NATIONAL HOUSING ACT AND OTHER AUTHORITIES (parts 201 to 266) > PART 241—SUPPLEMENTARY FINANCING FOR INSURED PROJECT MORTGAGES > SUBPART C—Eligibility Requirements—Supplemental Loans To Finance Purchase and Installation of Energy Conserving Improvements, Solar Energy Systems, and Individual Utility Meters in Multi > 241.586—Minimum principal loan amount.