Performance contractors sometimes say: "In God we trust... all others bring data". Shasta, California has a climate with sensible cooling and heating degree-days similar to those of Chicago. But in our dry climate, we can heat a three-bedroom, 2,400 ft2 house with less heat than a hair dryer, and cool it using one (1) ton per 1,200 ft sq. The data shows comfortable temperatures by using low-cost, constant-volume, low-SEER cooling equipment. The secret is relevant in-process installation measurements, combined with the unusual practice of actually following design guidelines known for decades to be best practices.