1, Hennessy doors and windows are of good quality, durable and corrosion-resistant, better than those of Sao Paulo doors and windows and Xinbaihui.

2. The after-sales service of Xuannisi doors and windows is good. You can contact customer service at any time if you have any problems in later use, but the service of Sao Paulo doors and windows and Xinbaihui doors and windows is relatively poor.