Installing an air conditioner in vinyl window

Hi,
We have new vinyl windows, and want to re-install our Fedders window A/C in a vertical double-hung window, for which the unit is made. It was easy with the older windows. I just used a wood frame and screws.
Using screws in the new vinyl window may cause permanent damage, so I need another method. The A/C unit is small, about 5K BTU. The usable window opening is 21.1" wide x 13.7" high (53.6 cm wide x 34.7 cm high), large enough to accept the A/C unit.
Does anyone have suggestions? Thanks!
Dugie
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No more or less than in a wood window. All you need is two screws to be sure the window is held in place to the sliding expander. In most cases, once the window is closed, the screw holes will be below the sill and not visible.
Only other way is to make a screw jack of some sort to put above the sash frame and below the widow frame to exert pressure down on the sash. You can use 1/2" threaded rod and a coupling nut in the center to expand them.
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Depends upon if it's an upper or lower level window. The install kits that the come with are worthless (only good for temporary use on a upper floor).
For my upper level I use pieces of hardwood that I cut to size for each side, stained and varnished (of course). Those go in on the sides. I have the piece of foam that came with the window unit doubled over and in the bottom channel of the window. The metal bar that came with the unit I used as a template to make one out of a piece of aluminum one inch wide and 1/8 inch thick that goes all the way across the window and has slots cut to fit the window channel. With my custom aluminum bar across the top and woddwn pieces on the sides and foam on the bottom, all that's left needed is to seal it. I stuffed insulation into some of the bottom areas and then used that metal HVAC tape to block air flow between everything else. Then I put some weatherstripping across the top aluminum bar. Trust me, there is no air leakage going through there! Then I stuffed some insulation where the upper and lower window meets.
If I were doing a lower floor window, I would want something more secure, and would have some stainless steel plates made that were U shaped (but shallow) so I could screw them into the window unit and the insides of the window itself, that and the coupling thing described ny the other person.
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replying to scott21230, CarolG wrote:
Hi. My main concern was that I did not want to put nail holes in my vinyl windows. Instead I used 4 pieces of wood: 1) I used a 2 x 4 that fits at the bottom and in front of the vinyl window, and the air conditioner rests on this board. The length is the exact measurement of the entire ledge so that the 2 x 4 is wedged tightly on both sides and cannot come loose. You can make it very tight with shims. 2) I have one board that sits on the outside of the vinyl window in the track from one side to the other as tightly as possible. The air conditioner sits on this on the outside of the window. (mine was 1x2x28) It is important that your air conditioner has a bar that you screw into the top of the air conditioner. This will hold the air conditioner in the window when the window is closed behind the outside of this bar. Now it is time to put your air conditioner into the window as directed, so that it is resting on the 2 x 4 on the inside and the 1 x 2 on the outside. As you bring the window closed behind the metal bar it will overlap the bar by a good 1/2" holding the sir conditioner in place. 3) I put two more pieces of wood between the top of the window casement and the top of the window. (mine were 1 x 2 x 13 each.) This keeps the window from opening and letting go of the air conditioner (make sure they fit very tightly). My air conditioner had L brackets, 1 for each side of the air conditioner and I screwed these to the 2 x 4.
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On 5/3/2015 8:44 PM, CarolG wrote:

Hard to visualize your situation. I'd suggest that you install the air conditioner so that there is no, zero, none, not any, force applied to ANY of the plastic window parts.
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On Monday, May 4, 2015 at 1:41:36 AM UTC-4, mike wrote:

the original question goes back to 2006.......
one of our vinyl windows warped and had to be replaced because of the weight of the very lage window AC unit that cooled our entire main floor
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Carol works in the trailer park.
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I cut a 2x4 to width of window sill (inside). Painted the 2x4 white. I used 90 deg. angle brackets on each end of the 2x4 and screwed them into the 2x4 top side and into the sides of the window frame (through sheetrock into the rough frame). I set the AC on the 2x4. The mounting flange of the AC rests in the vinyl window channel on bottom and one side but most of the weight is on the 2x4. I then cut a piece of 1/2" OSB (plywood) to fill the space on the other side. Painted white. The OSB also nested in the vinyl channel on bottom and one side. Note my AC also has an exterior support bracket installed.
On another house I built an exterior support and shelf with plywood and 2x4's extending to the ground. The shelf resting on the inside sill with shims to make it level. The AC did not touch the vinyl at all. I also used plywood to fill in space on the sides.
Kevin
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Put a support block of wood so the weight does not rest on the vinyl. Use white duct tape to hold the wings of the ac open and sealed. Dugie wrote:

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in
need
wide
A/C
Thank you all for the suggestions! I have enough info to install the unit safely.
FWIW, the window tech was here today for some window warranty work. He has 20 years experience. He said is was ok to let the unit rest on the small vinyl front edge at the bottom of the frame, no other support, except to drive a 5/8" screw at the top of the unit and into the sash.. Use wood blocks at the top to prevent opening of the lower sash. He'd never been asked about A/C install in vinyl windows before. Neither had Mitten Vinyl, my supplier, when I called them.
BTW, it's a 2nd floor window.
Dugie
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Sorry! I meant to include that I will NOT take the tech's advice.
Dugie

A/C
screws.
21.1"
the
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windows well off ground here, i put some wood blocks on the brick edge place the air conditioner resting on the wood blocks, open the extensions and duct tape everything in place.
we have a fenced yard with doggie door if someone wanted in just come thru dog door.
air conditioners are haeavy i seriously doubt a thief woiuld mess with one, easier to kick in door, jimmy lock or break convenient window.
wonder id stats are available oin broke in by removing window AC
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1 horizontal bar (I used hardwood) that fits into window channel and screws into flange on top of AC. 2 vertical pieces of wood on the top on the vertical slider to block the window from being pushed up.
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