window or through-the wall air-conditioner?

The contractor who's converting my 24 x 40 attic to office space suggested that the new 20,000 BTU air conditioner be installed in a sleeve through the wall under the gable end window, rather than just using a window unit AC. Besides a neater appearance, is there any advantage to using a sleeve unit? Also, if I had to replace it down the road, would it difficult to find a unit that fit the same sleeve,( i.e. are there standards for AC sleeve dimensions?). Thanks! --- John
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

You can see through the window?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

I feel a through wall unit gives these benefits: A better, more solid fit; no loss of day light; better control of day light with shades.
Through wall units are available and should be available for as long as window units. They are more available in some areas than others.
Tom Baker
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Technology is on your side. Newer units are usually smaller than older units of the same capacity. Chances are, you may have to put in a filler. Ed
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

compressor is outdoors and only require a 2 1/2" hole to the outside for refrigerant piping and condensate line. The lower end thru the wall (hotel style units) can be the source of much more noise than the higher end units. Which ever you choose go for a quality unit that will have a lower db output. Also if you have a need for heating you'll need a heat model or electric heat strips.
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.