This 12-Hour Wisconsin Energy Efficiency for Dwelling Contractors Continuing Education Online Anytime package includes 3 online HD-video courses equal to 12 credit hours of approved continued education: 3-Hour Key Construction Math Concepts, 3-Hour Business Responsibilities and 6-Hour Energy Efficient Building. You are required to complete 12 hours of approved education every two years to keep your certification. You do not have to take all 12 hours in one course. Wisconsin sends out a renewal notice 4-6 weeks before your renewal date (which is 3 months prior to your expiration date). Students will have six months of access to course content.