Need feedback on Trane vs. Carrier proposals
I am looking to upgrade the system on my house. Here are some important details.
15 year old Polysteel house (~R50 walls)
Currently have 4T Lennox compressor and 5T air handler, also 15 years old. No real issues with the equipment.
I've had two different heat load calcs done. One came back at 3.3T and recommended a 4T system, the other calc came back 4.5T and recommended a 5T.
The two systems that I'm looking at are:
5 ton Trane XL16i and TAM7
5 ton Carrier 25HCB660 and FV4CNB006
The quoted price on the carrier is $1400 less than the Trane.
1. If I want a 2 stage compressor and variable speed AH, is one unit better than the other? Does one have features that the other doesn't? The only difference I see is the cost and a 12 year compressor warranty on Trane vs. 10 year with Carrier.
2. Is it common to have such different heat load calc results from two different contractors?