Carrier and Amana are the leading brand names of air conditioners. They do make the best quality products and offer replacement parts as well.
Trane makes some of the best air conditioners that are on the market today.
Frigidaire brand air conditioners are the best for small apartments for they offer the greatest range of air conditioner sizes to accomadate small apartment living.
The cost of such an air conditioner varies depending on the brand and time of purchase. Currently, such an air conditioner can be purchased for around $180.
Rheem
It depends on company or brand because it varies according to brand and features but generally the cost for new air conditioner is about $3500 - $6000, and also depends on your needs where you live.
depends on brand of air conditioners
Amana offeres a Limited Lifetime Warranty on their air conditioners.
Goodman
Luxaire
I had a FrigidAire in college and my wife had a Kenmore, both worked great! Check out this site for reviews: http://products.howstuffworks.com/air-conditioner-reviews.htm
You have to get it recharged. you have no freeon left which makes the cold air
The tonnage for a Heil air conditioner model # ACS030a2c1 is 2.5 tons. The 30 in the model number indicates that the air conditioner is 30K BTU's which makes it 2.5 tons.