I'm a homeowner, and I've received contradictory opinions from 2 air conditioning professionals about what I need. My situation is that our furnace has a coil unit that was installed 3 years ago. Around the same time, we had our condenser unit removed, and so we've been without A/C since.
We now want to get a new condenser and get our A/C going again. One guy said our coil was rated 10 SEER, and that new regulations called for condensers to be rated 13 SEER or higher, but that he could probably find us a 10 SEER condenser. The other guy said our coil was rated 2.5 tons, and that this would be compatible with a 14.5 SEER condenser which he recommends. Both cost estimates were in the same general ballpark, so that's not the issue. The issue is that I want to purchase a condenser that's matched properly with our coil, and that will give us the optimum performance and efficiency.