Are you planning to install it your self?
I bought one off of ebay.
15000 BTU with heat strips.
Dropped right in where the exhaust fan was in the bedroom.
If not buy one through someone that will do warranty work on it if needed without any extra cost.
Bought one from extremepartsworld.com Advent 15k complete pkg , the only thing is my first AC is ducted so my ceiling is about 7 in thick instead of 4 in. Now I have to make an extension to fit tha cooling exhaust. But it works great lots of cold air .
"Well that didn't go as expected"
2015 Chev 2500HD Highcountry Duramax
Cedar Creek Silverback 33IK
Donald&Casey cairn terrier
Rest in Peace Mary my darling wife.
Scottish by birth Canadian by time.