The vents would be in the ceiling if you had gas heat. That is a pretty typical setup for ranches on a slab. The heated air (from the vents) would feel "dryer" if you had gas heat since the supply temperatures are higher with a gas furnace than a heatpump and the supply air would have a lower relative humidity. The actual relative humidity in the house would not be impacted. Have you talked to an HVAC company about installing a humidifier? They do make them for heatpumps. Keep in mind that the average dewpoint in January is about 50F. When that amount of moisture is heated to 70F, a typical indoor winter temperature, you wind up with an indoor relative humidity of about 50%. This is generally considered to be "desirable". The dewpoint on any given day can certainly be lower and the inside relative humidity will drop as the house "breathes" the dryer outside air but in an average sense we aren't "dry" in the winter. You certainly don't want indoor relative humidities of say 70% as that is probably not good for the house, although your nose might like it.
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Originally Posted by CFrance
I believe there is gas heat in Belvedere, just south of 466.
My biggest complaint with the heat pump is hot air rises, and the vents are in the ceiling, so we have to set the temp higher to keep the house warm. That and the fact that it is such a dry heat. I get nosebleeds all winter long, and you cannot put a humidifier on the heat pump. We'd need those small humidifiers everywhere as there's not a good place for a bigger one. And I don't like the cold mist humidifiers as they make the air feel chilly.
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