I recently moved into a home that has 2900 sqft, single level built in 1984. The interior was gutted about 2 years ago and remodeled, including new plumbing and low e glass windows. As soon as I moved in, I upgraded both the inside and outside electrical panels.

The 2 items I have let are the A/C unit (or perhaps Heat pump here in Orlando) and attic insulation. I know the attic insulation is R19 so I would like to upgrade to R30 with blown in insulation.

The A/C unit, air handler and coil unit are Rheem with a 10 seer rating on the outside unit. I assume it's single speed only. It was built in January 1999. It seems to be working ok and I plan to have a service performed on it this weekend.

Considering the unit is 9 years old and only a SEER of 10, should I upgrade to a 14 SEER unit? I am also trying to get a feel on Trane vs Carrier vs ?, and there does not seem to be a consensus on a superior brand.

Thank you for your input.