Is there less risk of oversizing a system with a modulating furnace, variable speed blower and 2 stage condenser with a smart thermostat?
I know it's an expensive option, but with some of the rebates that favor top end systems and the tax credit, a Cadillac system is not much more than a Chevy right now.
I know that load calculations and proper sizing is very important, but so is the "wife factor" of too hot in summer or too cold. I would argue teh wife factor is more important that any Manual J output.
Can the use of this kind of equipment insure against undersizing and complaints of too hot and too cold, while still keeping the system effecient?