NO!! I need help. NO ONE uses this system here. In addition the preferred and by far most common heating system is hydronic (either baseboard water or, if you can afford it, in-floor of some sort). Consequently contractors constantly urge us NOT to use an air system at all (the local term is "scorched" air) and most do not install them, usually just commercially or in retrofit situations.
So, since tight houses here have a moisture problem, some sort of ventilation is added--passive ie: vents in walls or closets or most expensive an HRV--a controlled air to air exchanger with built in heat recovery. This requires installation of ductwork in ADDITION to the hydronic system already installed.
Since I want a dry house, and I like forced air, and wish to heat domestic water with a boiler (electricity is expensive for this)....What I've found is that one can install an air handler which heats the air with water from the boiler using an arrangement of tubes and a blower to the ducting system.
It is this "hydro-air" system that I am interested in. I have found a device that combined the air to air exchange and the air handler in one unit. Some have homes that can use their domestic water to flow into this unit--therefore no boiler would be necessary. This is the Lifebreath clean air furnace. It's only about two years old so it's not widely in use, yet.
Even if you are not familiar with the hydro-air systems, I'm still interested in answers to questions 3 and 4?? These should be she same as a standard forced air system.