Texas: Options for cooling just bedroom at night

[aircooled53]

2200 sq ft, 1 story home in Dallas, TX. Built in 1950's. 5 ton AC, Janitrol 10 SEER. New American Standard variable speed, 2 stage 80% furnace. We've had a small window AC that we (empty nesters) have used past 2-3 summers for bedroom at night, setting thermostat on main AC at 85. Both of us work during the day, when we also have the AC set at 85. Thus, AC is on for a couple of hours in am and then in the evening. (In spring and fall we use whole house attic fan to pull in outside cool air.)

It seems to make a lot of sense not to cool the entire house at night, but the current arrangement just is not satisfactory. The window AC is noisy and we're concerned about safety (window faces back yard, making easy entry for a burglar).
We have a very small 1/2 bath off of our bedroom, with a window that is too small (20" w X 36" high for any window AC unit that I've ever seen.
Are there other reasonably priced, efficient options we could consider to cool just our bedroom at night?

Why not spend a little cash and replace your Janitrol with better unit and zone the home with a system that cuts air off to other area's at night and give bedroom more air while sleeping.

AS~Std Variable drive
+
Coil/TXV
Condenser 14.0 Seer
2 Zone system
Cut your electric bill down and save.$$$

What part of Dallas?

[Billss]

Didn't know that it was possible to have two zones using just a single AC unit?

[air2spare]

Didn't know that it was possible to have two zones using just a single AC unit?

you could even go three....wouldn't recommend any more than that

[beenthere]

you could even go three....wouldn't recommend any more than that

If given proper consideration size, 4 or more zones is not a problem.
Just gets expensive to install.

I have some single stage heat pumps with VS air handlers, that have 5 zones.
Used EWC for the zoning.

True, I used a combination of bypass, and a dump zone into a hallway.