Odds are VERY HIGH the 3 ton systems was only delivering about 2 tons. This is why the house was hot, it wasn't because the 3 ton wasn't big enough. To get the full 3 tons ductwork and system charge has to be right. 90% of the time they aren't right and system performance suffers severely. Hopefully they get the 3.5ton right and it delivers it's rated performance. If you notice a HUGE difference, you can bet the old system wasn't delivering anywhere near it's rated capacity/efficiency.
100k furnace is nuts for a house in Texas that's under 3,000sqft. Unhook the 2nd stage, you wont be needing it. Yes, you basically just overpaid for a 70k single stage. Surprised you spent the $$$ for 16 SEER/96% AFUE if you plan on moving. The 96% will NEVER pay for itself in TX. the 16SEER MAY pay for itself in a few years, depends on how much more it was vs the 14SEER.
Let me guess, the contractor used 500sqft per ton sizing. It's worked since the 1960's, why change now?
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