Repair Ie Can I Withhold Rent When Maintanance Takes Toooo Long To Repair Problems, Ie. Air Not Working For 3 Weeks?

Can i withhold rent when maintanance takes toooo long to repair problems, ie. air not working for 3 weeks? - repair ie

Air conditioning is out there 3 weeks to get to run around maint. Persons in apt. he had to buy the small window unit. Not working I withhold rent for day, or call and have repaired and bring deduct what you pay for the rent