Existing Heating Ducts - Replacement

Hi,
I currently have a forced hot air system in my home with a small maze of output & return vents in the basement.
Since the oil heating unit still works (at 80% efficency mind you), when I go to upgrade it I want to add central air as well as replace all the metal ducts with a smaller PVC (2" or so) so that I could put a drop ceiling in the basement. I want to set it up as an entertainment room/area but cannot do so with a 7 1/2 foot ceiling with only 6 foot of clearance in some areas because of the ducts.
What are the drawbacks in using the forced PVC system vs. metal ducts?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
You are not going to get the volume of air through 2" ducts to do the job. There are some high velocity A/C units for homes with existing hot water heating systems, but they tend to be noisy and they are not intended for heat distribution. I would also guess they are less efficient.
Sizing of ductwork has to be based on the needs of the heating/cooling system, not the convenience of a basement remodel, unless you want an uncomfortable home.
--
Joseph E. Meehan

26 + 6 = 1 It's Irish Math
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.