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High velocity system still requires one or more outlets depending on load.
When ever we get a call from someone stating they have a 130
year old home and, they would like to have ac install...
we get all ugly in the face or should I say uglier.
Your best bet would be to have someone come out and perform a load calculation.After that maybe a audit to help point you in the right direction on improving the envelope first.
With the improvement to the building envelope you'll find
that your heatplant would or, could be smaller.I know for a
fact it would be much cheaper to run and give you a better comfort level.
It really matter not rather its a high velocity system or a conventional system.The both of them are made to transfer heat from one place to the other.What does matter is keeping the time down on when that heat will get thru the building envelope.
Side note and off topic.When growing up I thought I was the only guy name Don,no not Donald.Now I'm seeing more Don's then ever before.