I have never been able to keep an office chair from squeaking. I build a 6' bench seat across the house. The key to a bench seat is to add an angled plywood back to it so it is more comfortable. I also use liquid nails and screws to build all my houses (4x6) and they work great.

I also build windows out of real 1/4" glass. The glass slides in a groove that I use my router to cut into a piece of solid PVC. I buy the PVC at lowes and it comes in 1x4. I can rip it to 1x2, cut my groove as close to the edge as I can while keeping a little lip (1/8-1/16"). The PVC will not swell if it gets wet so the glass wont stick. Then I have room left to screw the plastic to the wall. There is so little an opening between the window and the wall that bugs (especially wasps) cannot get into the house. Real glass is more expensive than plexi but it holds up better. It can be cleaned with windex, where the plexi will turn yellow and scratch easily. Another thing I do before each season is remove the window from the frame (when I am cleaning) and apply a little gulfwax to the edges. It makes the glass slide easy and quiet.

Another thing I add to my houses is a piece of stall mat. I get them at tractor supply and cut them to fit. Stall mats are heavy rubber mats and work as an insulator really well. If my feet dont get cold I can sit all day. I also cut a little strip of the stall mat and apply it to the bottom of my windows for a quiet gun prop.

With the windows and the stall mat, even on a real cold day the house will warm up pretty good. If you can keep the wind off you it helps to see more deer and not get so cold.