By using a blown and netted fiberglass, the R values in these homes are extremely high. A normal brick home with a 2X4 wall will usually have an r value of 13 to 15. These homes are about R17. A good thing about vinyl siding, it is neutral in conducting heat there by making the job of cooling a home easier on the ac unit. Brick is a conduit to heat, and helps to hold heat in, in the summer time.