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The refrigerant (freon) in any air conditioner should last the life of the unit. If not, you have a leak.
10 years
When well-maintained it can last for ten years.
It depends. Usually they should be checked when you do your regular 3K oil change. If the filter is dirty--a dark gray--then it should be replaced.
Yes, a central air conditioner can be installed in a house that currently uses room air conditioners as long as there is a place to put the fan outdoors.
It would take 30 min. average time to add this charge to the system.
Yes, as long as it a gas system and not a electric heat pump system
No, the air conditioner would not last long at it would be running too slow.
It sometimes depends on the temperature difference between the condensing unit and the air handler. I would say normally no more than an hour.
15 yrs
An air conditioner should be good for about 20 years. If it is brand new and it stops working it may have just frozen up. If this happens just simply unplug it for a while
If it is an ordinary conditioner then you only need to leave it in for 2 minutes but if you are using a treatment or leave in conditioner you should have it in for 10-15 minutes. Don't put conditioner on the roots as this is new hair. Put it on the middle length and ends of your hair.