###### Q1. What are the contributions in "A convex approach to a class of non-convex building hvac control problems: illustration by two case studies" ?

In this paper, a convexification approach is presented for a class of non-convex optimal/model predictive control problems more specifically applied to building HVAC control problems. The suggested method is especially useful for optimal building HVAC control/design problems which include non-convex bilinear or fractional terms.