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Sounds like they're blowing hot air! (bah dum dum)

Seriously, steam pipes are at best 1" and hydronic 3/4", even high velocity system ducts are 2" diameter, 4x the capacity of the 1", and they use more than 1 per room. And you need an air return, the bedrooms in my mom's FL condo get hot if you don't crack the door to let the air out to the return. They don't explain crap on their website, be cautious even though they seem to be a large company.

This company had an ad in the Sunday NYT for installing central air thru existing hot water or steam radiators. Has anyone looked into that?