We noticed a water spot in our hallway, assuming it came from the AC we called out a company to service our split unit. Gentleman actually did a "water test" on the heat exchanger, pulled it out filled it with water from my garden hose and it leaked so he told me it had to be tagged and I would have to replace my furnace. In addition, my drip pan under AC is completely rusty and inside the AC unit the coil is all rusty too. So he said I should just replace the entire unit; AC and furnace. We currently have a zephyr system???...its 14 years old, put in when the house was built. I've had 3 different companies come to give me estimates. One is pricing me for a 15 seer 3 ton split Day & Night unit, the second a 13 seer 3 ton split Rheem unit(both around the same prices). The third wants me to go with a 13 seer lennox but the guy was a total jerk and I do not want them in my house again. Anyway I am wondering which unit is best? Also 2 of these companies questioned if the first company(they actually knew who the company was without me telling them) and couldn't believe they actually pulled the heat exchanger because its a hard process and were wondering if they were just trying scare tactics to get me to purchase a new unit. Could this be possible? Has anyone heard of this?! I've been trying to research it online and it just confuses me more! Help!