Turning a thermostat "higher" means that you've turn it "colder" , turning it "down" means setting it "warmer"
( yeah I know, it's bass-ackwards)
Sounds like it went "south" for the summer
, it's probably bad / stuck closed & it's causing the compressor to run 24/7, time for a new one. if your T-stat' is the contact type ( senses the temperature of the evap' coils & screws to the metal of the evaporator, then you can get an A12-701 or equivalent, Funtronics & sodajerks-works sells them too.
PS: set the T-stat' to mid-range & try rapping the shaft end of the T-stat with a plastic end of a screw driven & see if it's just a little stuck, sometimes this can free up a pair of dirty contacts inside,