AC question!?

An air conditioning unit is not "variable" power.

It has only TWO modes: ON or OFF.

If the heat load is too great for the air conditioner to remove, it will just run continuously and remove only the heat that it can.

Turning the thermostat lower doesn't make the air conditioner work harder.

The thermostat is just a simple on-off switch that reacts to the temperature.

If you need MORE cooling power, then you need a larger capacity air conditioner, or a second air conditioner.

To all the "experts" who think the evaporator "iced up", please understand that the relative humidity in Las Vegas is 7% right now, the temperature is 100° F, and the dew point is 27° F (at 9:50 p.m. July 7, 2019). The temperature has been over 100 and is expected to be 109° F in a few days. Duh!!!

This asker has no common sense.

And some answerers don't either!

Las Vegas is in the Mojave desert, by the way.

The air conditioner is lowering the ambient by 35°!!

p.s. A thumb down? Lol! 7% humidity!!!

dirty filter, dirty coil, low refrigerant. Based on what you say sounds like the inside coil is freezing up. if you changed your filter an let the ice melt off. and it still freezes you'll need a hvac service tech.

If you do decide to try to clean coil because it visibly dirty. don't use wire brush an donot uses a cleaner unless it is a self rinsing coil cleaner. I've had customer go from a 100 200 dollar job. to a 1500 job because they ruined the coil.

I agree with the iced up or frozen Evaporator answers here. The symptoms are exactly right, which means a leak of refrigerant. It could be an airflow problem as well.

So, you'll have to hire an hvac shop.

By the description it sounds to me like your system is freezing over.

The usual causes are lack of airflow or low refrigerant.

Unexperienced laymen will always say low refrigerant, but let's check the obvious first: replace the filter. A blocked filter can obstruct enough air to allow the unit to freeze up. So replace it. It's a few bucks.

What else? A bad motor or motor capacitor but you said you can feel airflow after giving it a few hours off. In that time it thawed and air was able to flow through the coils, so we know the blower is moving some air. Whether it's enough, can't say without looking at it myself.

Replace the filter. Turn the stat back up to 75. See how it does. If it freezes up again, you need a pro.

[edit]

Oops, I see you replaced the filter already. Okay, good. But if that didn't help then you need a pro, no question.

you need a technician. might be the inside blower motor isn't turning on, might be the run/start capacitor that does that needs to be replaced, might be the inside fan is dead, might be the unit needs refrigerant, .... and you're qualified to detect none of these

sornetirnes they dont work that good if it gets too hot out, rnine dont

I am guessing that your unit iced up. Check it and see. If it's got ice all over the inside; then it is. Shut it down for a day or two (sorry about the heat!) and turn it back on again. It should be fine for a while. Your unit needs to fixed. Something is not allowing the condensate to drain away