Hi, We are building a house in CT and it is 3500 sq ft with Anderson windows 400 series windows and R50 in attic and r21 in walls. So far I received two qts, one for water furnace 7 series/5 series 4ton with the duct work and two zones without well digging 38500/35,500. D super heater is 3000, Air exchanger is extra for 3500, instant water heater is extra 3000, backup water coil is another 2500, and humidifier is 800, well digging is 14 per sq foot for two 350 feet wells. There will be 2000 dollar additional instant rebate on water furnace 7 series model. Second qt is for climate master 5 ton ttv064, with hot water, duct work, 2 wells 475 feet, and d super heater 58000. This is without instant water heater, humidifier and air exchanger, this guy is telling that the direct vent water heater with do the trick for air issues. Both the quotes are very high. How should I find out the cost? Do I need to install the air exchanger, d super water heater, and humidifier?