I currently reside in Northeast FLorida in a 2070 SF Stucco 1 level home. Looking to replace an 11yr old Tempstar 3.5t HP and 4.0t AHU(Builder grade, 10 Seer). Current tech said condensor is starting to show signs (pulling high LRA?) of failure soon.
I've had 4 contrators provide their quotes and the sizes are different. I'm not aware of any performing any load calculations as they all left to provide quotes. The current system for the most part has been doing the job but it seems to run a long time during the afternoon. 60min on and 10 min break before starting again for another 60 min.
Quotes from 4 contractors received were all for 15+ seer.
1. Lennon 3.5 ton inside and out (from current contractor and tons does not match original equipment they installed)
2 Rheem 4 ton inside and out
3. Trane 15XR 4 ton out and 5 ton Hyperion Tam7 variable speed ahu. - is 5ton overkill?
4. Trane 15XR 3.5 ton out with 3.5 Hyperion Gam5 ahu.
Carrier performance series 3.5 inside and out
How can the tons be different from each contractor? Will a 4 ton be considered too much and have humidity issues and short cycles?
I've read online that the coverage area should be 400sf per ton, 500sf per ton, and 500-600sf per ton. What is the standard in 2012?
I'm really lost on making a good decision.
A lot of places say trust your contractor but I've only used one and their guote for the lennox is almost $2000 higher than the rest for a comparable model so they are hard to trust and they always want me to replace this and that when they do there Bi-yearly checkup.
Any direction toward what would be the best ton for house would be appreciated.