My house is single story 1400sqft built in the mid-1960's raised on piers. The original central HVAC system was a high velocity system with electric heat and AC. The ducts are 2in diameter at the vents. There's one air return in the center of the home.
Last Fall, one of the fan blades on the condenser unit broke and I began a long, confusing, and so far fruitless journey to getting my AC fixed.
I'm facing many issues, including the fact that the house is located in an area that has recently been reclassified as a flood plain. The existing air handler is in a crawlspace below the 100-year flood level, so the new air handler will have to be relocated.
But the question of the moment concerns the high velocity nature of the original unit and what can I reasonably replace it with.
My HVAC contractor has quoted me a 2.5 ton 13 SEER split system forced air heat pump to connect into the existing duct work with the addition of one new air return vent.
I'm worried that the 2in ducts are unsuitable for a conventional forced air system. But my contractor has not indicated that the ducts need to be replaced.
So my question is: is this a problem? Is it possible to use a conventional air handler with the small ducts that currently exist, maybe by oversizing the system?
Or is it necessary to redo all the ducts to work with conventional forced air. Of course, because it was originally a high velocity system, it does not have air returns in each room. So I'm thinking that maybe additional returns would be required in this scenario.
Or should I go back with a high velocity system.
Not sure what other information is needed. Ask away and I'll respond as best as I can. With summer coming, this thing is putting a lot of stress on me. :-)
Thanks in advance.