i am in the middle of getting quotes for central air for a tri level home using the unico attick system.my question is what are the best top five reliable,durable,dependable 13 SEER to 15 SEER air conditioning units to install outside for a tri level home thank you.

Considering there isn't a rating agency, nor method to do that, there are none. Adding together all the different brands that companies use, there are only about five companies making them.

www.heatpro.us energy businessmen's knowledge

Yes, you really have to find out the MAKE and MODEL to get good answers. There IS more than one machine made.