[Chatbrat]

About a year ago I met a village hang man type person. He said he has extended a/c into the garage of homes here by t'ing into the existing ducts.

couple of questions?
1)has anyone ever had this procedure done ?
2) did it work?
3) our a/c is 3 tons 15 seer & our house is 1910 sq feet
4) we have a 2 car garage + golf cart

Thanx all

[biker1]

I suspect this is a fundamentally bad idea. If he is planning on extending a supply duct to the garage and not a return duct then you will create a negative pressure inside your house that will be satisfied by outside air, perhaps from your hot attic, unless you keep the door to the house open. How many CFM (cubic feet per minute) is he planning on delivering to the garage (whatever is delivered to the garage will be subtracted from what is delivered to the rest of the house)? From the CFM, you can estimate how many tons of AC would be delivered to the garage and subsequently not delivered to the rest of the house. Is he planning on giving you the ability to close off the duct to the garage? Have you insulated your garage door and ceiling above the garage? If your garage faces west or east and the garage door is not insulated then the heat load on your garage will be large. If you have a block house, the outside garage wall is not insulated. I suspect this is true for framed construction also. Depending on the orientation of your house, the insulation, and how cool you would like the garage to be maintained at, the heat load on your garage could be several tons (you can compute this, not very hard). Your system is not oversized enough to handle that so you should not expect a cool garage and the rest of your house may not be maintained at the temperature you want. If you really want an air conditioned garage you should probably talk to an HVAC company, have a heatload calculation done (actually required in FL), and look into installing a separate system (assuming this is actually allowed by FL code).

I have one friend who did have this done to a small workroom isolated inside his garage, less than 100 sq. ft. He had a supply duct with a manual damper installed by the company that did his HVAC. The walls were insulated.

Originally Posted by Chatbrat

About a year ago I met a village hang man type person. He said he has extended a/c into the garage of homes here by t'ing into the existing ducts.

couple of questions?
1)has anyone ever had this procedure done ?
2) did it work?
3) our a/c is 3 tons 15 seer & our house is 1910 sq feet
4) we have a 2 car garage + golf cart

Thanx all

[RickeyD]

Originally Posted by Chatbrat

About a year ago I met a village hang man type person. He said he has extended a/c into the garage of homes here by t'ing into the existing ducts.



couple of questions?

1)has anyone ever had this procedure done ?

2) did it work?

3) our a/c is 3 tons 15 seer & our house is 1910 sq feet

4) we have a 2 car garage + golf cart



Thanx all

Won't work, your garage area needs a dedicated system with a 1 ton capacity or greater. SEER has nothing to do with it.