Warranty period of residential property?

Under normal use conditions, the minimum warranty period of residential property is: (1) roof waterproofing works, and the leakage prevention of bathrooms, rooms and external walls with waterproof requirements is 5 years;

(two) heating and cooling systems, which are two heating periods and cooling periods; (three) the electrical system, water supply and drainage pipelines and equipment installation for 2 years; (four) the renovation project is 2 years;