How to reconfigure a window air conditioner to get colder than 61 deg.
Colder on floor or window.
Concrete clay or other masonry does a great job of holding heat even if it s colder than we d like.
Typical solutions include putting rugs on the floor.
Some include floor heating in tiles.
Because your problem is created by a lack of room for warm heated air to circulate between the floor joists we have to find a way to allow that to happen while maintaining a proper level of insulation.
Combined with thermal bridging through the floor joists which are almost directly exposed to the cold outside temperatures it will make the floor surface feel cooler than the surrounding floor.
Some floor materials are naturally colder than others.
More radical folks change the flooring.
Hardwood tile and linoleum floors are colder than carpeted ones because the carpeting provides extra insulation on the floors.
A quick and inexpensive way to make a window refrigerated air conditioner make a room colder.