Air Conditioning - Installing A/C using heat ducting

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airevac39
10-31-09, 10:01 PM
Can you use the existing heat duct? The house I am looking to buy does not have central air cond. It has central heat and a window unit for A/C. Can I buy a central a/c unit and how do I install it? About how much will it cost. Help?

Jay11J
11-01-09, 06:46 AM
Yes, when you use central air, it uses the same duct as your heating system use. It has a coil put above the furnace, and the blower in the furnace moves the air though the A/C- Coil.

Get 2 to 3 bids from dealer on what it may cost, too many variables out there for us to get you a price on line. Make sure the dealer do a Manual-J (Load Calc) on your home for the correct size unit.
airman.1994
11-01-09, 09:39 AM
Let me add that the duct may not be the correct size for AC. Your contractor will perform a heat load on the home and will be able to tell you if the duct is the correct size for AC.

ray2047
11-01-09, 01:12 PM
Also the blower may need to be changes out for more air flow.
HVAC RETIRED
11-01-09, 05:46 PM
After a Manual J load calc is performed for each room, they need to do a Manual D to properly size the duct system & air handler for the A/C system.

Also, the ducts might need to be insulated.(?)

Do a Google & Yahoo search for more in-depth information!
GRIMKNOTME
11-02-09, 04:36 PM
If just for heat primarily is probably not insulated also , just another prob thought id mention...........as in below reply..........................