Replace boiler or add high velocity a/c and heat pump?

[h_curtis]

I have a 60+ year old boiler and no duct work. I would love a/c in the house but, don't know how efficient a heat pump is on a Unico or SP and if it is enough here in Pittsburgh where it gets pretty cold. Do I replace the boiler and get a/c when I can afford it or don't do the boiler and put in mini ducts with a/c and a heat pump. I will miss my hot water heat if I do this.

Please if anyone has any experience with the decision I would be very grateful.

Thanks,
Curt

[beenthere]

Moved to residential.

[BaldLoonie]

If you want comfort, stay with your hot water heat and a modern boiler.

Is this a 2 story house? Still could be cooled with conventional ducting, doesn't have to be high velocity though it is easier. Don't need a lot of vents on the 1st floor since cool air falls. If single story, I'd definitely skip high velocity.

[h_curtis]

It is a two story with a non heated attack that is finished with very small crawl space around the parameter. It isn't an easy job to do a/c in this home!

Thanks, I am looking at the boilers now.