I have heard different things about hydro air systems.
I am considering getting one because it is a 5000 SF house and a 1500+ SF addition is planned and I heard that it is easier to expand a hydro system and is better for larger houses. However, I have read some complaints, such as this one:
I would not install a hydro-air system. We just moved into a new house (8 yrs old) with hydro-air. The house is about 2800sf and has central a/c too. It has 9" of insulation in the attic, 4" in the walls, plus vinyl siding with a thin layer of foam insulation. We live in MA, so it get very cold here. I don't like the heating system at all. In the winter it runs anytime the sinks are turned on (even if you aren't using hot water). And because it uses a blower run by electricity and hot water heated by oil, you are essentially tied into using 2 fuels to heat your house. Inefficient. During summer, I turn the whole system off, except when I need some hot water to shower. We saved over $100/month in electricity alone by doing this... not to mention the oil. We have not lived in this house for a full winter yet. We moved in in March, which was the coldest March on record. This house used 100 gal of oil in 10 days with the heat set to 60 degrees while nobody was even living here.
Is there validity to this complaint?