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DIY Central A/C install, anyone done it? #7846283 05/21/20 02:11 AM
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Im tired of the window units in my 1940's farmhouse. Ive got a 3 ton package unit Im installing. So far Ive just gone through the unit making sure everything was good with it, changed out all the insulation inside the unit, poured a concrete pad for it to sit on, and starting gathering material. Man HVAC stuff is expensive. Even with my 10% military discount at HD Im going to end up spending right close to $2K on materials. I had a local company give me a quote on doing everything and it was $5400, SO, Im doing it myself. My house is 1150 sqft and Ill have 8 drops to rooms.

Im going to be running all flexible ducting with R8 insulation. 18" for starting out for return and 16" starting out for supply. Ill be going up the wall outside and into the attic, building an insulated box around it up the outside wall.

For the return, Im starting with an 18" R8 flex duct and then Y'ing into two 14" flex ducts going to two 20x25 return boxes and grilles. Im confident on the return side.

The supply side, without being able to do all the tests the pro's do to check resistance and flow and all that other crazy stuff, Im really just guessing. Ive planned it where the cfm's are correct going through the system with the different sizes but that's about the most I can do.

Has anyone ever done something like this themselves? A couple of things im not sure of are

Which size register vents to use for the drops
The 10" drop Ive got running to my LR would it be better to have a single 10" to a vent or Y that off to two 8" vents or would that make a difference?




The blue number is the size of the flex duct, the black is the cfm that duct carries. I think I have it balanced ok.


SUPPLY- 16" flex duct from unit, up wall into attic, then branching down to 14-12-etc.


[Linked Image]


RETURN - 18" flex duct from unit, up wall into attic, then Y's into two 14" flex ducts running to two 20x25 return boxes.

[Linked Image]

Last edited by Nathan at Fork; 05/21/20 02:12 AM.

[Linked Image]
Re: DIY Central A/C install, anyone done it? [Re: Nathan at Fork] #7847203 05/21/20 11:51 PM
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Re: DIY Central A/C install, anyone done it? [Re: Nathan at Fork] #7847207 05/21/20 11:56 PM
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Better hurry, that Attic is going to get hot soon!

Re: DIY Central A/C install, anyone done it? [Re: Superduty] #7847334 05/22/20 02:28 AM
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Originally Posted by Superduty
Better hurry, that Attic is going to get hot soon!


Too late!

Re: DIY Central A/C install, anyone done it? [Re: Superduty] #7847356 05/22/20 03:02 AM
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Originally Posted by Superduty
Better hurry, that Attic is going to get hot soon!


It wont be too bad. IVe got a huge attic with 9' of headspace, keeps it from getting too hot.


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Re: DIY Central A/C install, anyone done it? [Re: Nathan at Fork] #7847471 05/22/20 07:11 AM
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Exhaust vents by windows, suck out that hot air before it has a chance to circulate with the cooled air.

A lot of good HVAC guys will tell you to install an exhaust vent in every room to help balance the entire house. I would at least put one in the far bedroom in addition to the living room and front bedroom.

Also, I would Y the living room vents into 2 vents


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Re: DIY Central A/C install, anyone done it? [Re: Nathan at Fork] #7847605 05/22/20 01:33 PM
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I would y the 10" and use 10x8 or 14x6 boots on everything but the 4 and 5 " use 10x6 or 8x4 on them you may wanna put dampers in the wyes on the main trunk

Re: DIY Central A/C install, anyone done it? [Re: Nathan at Fork] #7848762 05/23/20 07:26 PM
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Had someone tell me a setup using plenum boxes in the attic instead of all the wyes would be better. Any thoughts?

[Linked Image]


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Re: DIY Central A/C install, anyone done it? [Re: Nathan at Fork] #7848851 05/23/20 08:56 PM
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Originally Posted by Nathan at Fork
Originally Posted by Superduty
Better hurry, that Attic is going to get hot soon!


It wont be too bad. IVe got a huge attic with 9' of headspace, keeps it from getting too hot.



The first one I had replaced is stil in my attic. I don't go up there anymore.


Quail hunting is like walking into, and out of a beautiful painting all day long. Gene Hill


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Re: DIY Central A/C install, anyone done it? [Re: Nathan at Fork] #7849049 05/24/20 12:41 AM
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Originally Posted by Nathan at Fork
Had someone tell me a setup using plenum boxes in the attic instead of all the wyes would be better. Any thoughts?

[Linked Image]

easier to install, don't have to wrap if they are ductboard. you can resize the holes in them if ya need too. cheaper in the long run

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