We are building a new 2800 sq. ft. home. WE want the heating/ cooling system that will give us the best IAQ. We origionally wanted radiant heat/ evaporative cooler but now are considering a forced air system. Can a forced air sysyem be truly healthful? if so- which one would experts recommend? Would you choose radiant heat over forced air? Radiant heat will heat objects (furniture and appliances, flooring) and cause them to outgas more than if no heat were appied to them. We just want the system that will not cause ill- health effects. What do you recommend?