From the tables provided in this text, find the total thermal resistance (Rt) and overall coefficient of heat transmission (U) of the following windows and doors in U.S. units:
a. Double insulating glass (1⁄4 in air space)
b. Triple insulating glass (1⁄4 in air space)
c. Double insulating glass (low-e)
d. Triple insulating glass (low-e)
e. Solid wood swing door with metal storm door (13⁄4 in thick)