I have always felt Lennox and Trane were superior products, which is
why I sell them. I like stuff that helps me look good. I am in Myrtle
Beach, SC and the salt air has a major effect on the life of AC & heat
pumps. I have found Lennox & Trane outlast other brands here.

Lennox & Trane both make units with R-410a, which is the same thing as
Puron.

The installer has a lot to do with the performance of any system. He
should do a load calculation to determine the proper size of the
system. That DOES NOT mean installing 1 ton for every 500 Sq Ft of
floor space. He should measure sq ft of windows, walls, doors,
ceilings and floors. He should check the type of windows and which way
they face.

He should measure the air flow of the system with accurate instruments.

If he is just selling a box, look for another contractor.

Proper sizing has a lot to do with minimizing temperature swing,
keeping humidity controlled and system efficiency. Proper air flow has
a lot to do with efficiency, humidity control and comfort as well as
life of the system.

An oversized 14 SEER system with improper air flow, duct leakage and
improper refrigerant charge may only give you 8 SEER. Look up Advanced
Energy on the web. They have done a study on this. Look for system
effect.

Stretch