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Your ac contractor or engineer will determine the correct size.
To buy ac Freon you need to be certified and to add ac Freon to central air conditioning unit is risky.The air conditioner filters are normally located in return duct grills or in the air handler. Read how to change air conditioner filters.
It is not a good idea to block an A/C return. It will greatly decrease your A/C's efficiency and may damage the air handler unit.
Water will condense in the inside unit of the air conditioner. This is because the coils in the unit get cold (ad expected) and moisture in the air condenses on them like moisture on a cold glass. There should be a drain inside the unit to drain this water. Check that it isn't clogged.
That would depend on whether you have an upflow unit (yes) or a down flow unit (no), there are also horizontal left & right units. Flow is indicated by the the direction that the air travels into and out of the furnace or air handler.
Actually you can't, because an ac unit does not cool the air, it removes the moisture from the air that in turn cools it. An ac unit is actually a de-humidifier.
70
Cold air can carry less humidity than warm air so when the AC unit is cooling air the excess water falls out as condensation.
I have a York AC unit, model D1NA024N05606C. Can you tell me what year this is.
threethousand sq feet
It is broken. AC's usually blow cold air.
Return air vents.........