[hcknwscommenter]

What works for me in the northeast with an old house is a high velocity small duct air handler/distribution system (unico) coupled with a Bosch cold climate heat pump, with an oil furnace backup. This is forced air, so not exactly what you are looking for and I get that the heat from those baseboards is a better quality/less drying form of heat. I could upgrade to add a whole house humidifier to address this a bit. I use the heat pump most of the year, down to an outside temp of about 25F, although Bosch says I should be good down to 5F. The oil furnace runs basically Jan/Feb (but not as much this Feb as it's like 50F today). I've also extensively sealed/insulated the house (although there's always more of that to be done in an old house). It's a pretty good solution. I'd love for the air to water heat pump tech to work better, but I got tired of waiting.