Which makes more sense to you? CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10% ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%
Not making excuses for the install, but if the roof is pitched, it is a pita cuz you cannot buy factory curbs with the specific pitch. Have to be made in the shop and welded. We have to make 4 in a couple of weeks for 10 ton units.
If you really know how it works, you have an execellent chance of fixin' er up!