We will be glad to help you be comfortable again. A clogged filter restricts the flow of cooled air from your furnace. The result is your furnace works harder but delivers less cool air where it's needed. It can also cause the coil above your furnace to get so cold the condensing water will freeze, further restricting air flow and causing even more ice until you have no cooling at all. Check the blower belt and oil the blower motor.
Loose belts can increase air conditioner operating time.
Replace frayed or cracked belts. Make sure blower doors are replaced properly. Newer furnaces have a blower door safety switch and will not operate at all if the blower door is not properly in place. Check to see that vents in the house are unobstructed. The easier it is for cool air to blow into your home the less time your air conditioner operates.