The discussion forums are a real help to upgrade my knowledge of AC systems. I am now replacing my 16 year old Goodman AC condensor, coil, and 90% natural gas furnace. I live in Virginia and have a 2600 sq. ft house with a single system. 100,000 btu gas heat, 3.5 ton a/c have worked relatively flawlessly except humidity can be a problem in the summer.
I have narrowed it down to two estimates from dealers referred to me for quality work. The two recommendations are:
Carrier Infinity 96 two stage gas furnace with variable speed 5 ton blower
Carrier Performance Series 15 SEER A/C 3.5 ton w/ R410 refrigerant
15 SEER Coil 4 ton 21" wide
Warranty: 10 year compressor, coil, parts + lifetime heat exchanger
2 year labor warranty from installer
I can buy a 10 year labor warranty (actually 8 additional years).
Amana 95% STG natural gas furnace with variable speed blower model: AMV90904DX
Amana 15 SEER A/C 3.5 ton w/ R410 refrigerant
Honeywell Vision Pro 8000 thermostat
Warranty: 10 year all parts & labor warranty
lifetime unit replacement warranty
Both installers tell me the VS speed blower ups the SEER rating of the A/C to make the 15 SEER A/C qualify for the energy rebate on the entire system. Correct?
Both plan to use existing 2" exhaust line for the gas furnace. Both plan to use existing refrigerant lines after cleaning the refrig. lines with nitrogen. The lines are fully built in to a finished basement.
Everything I read on the threads says the two systems have about the same reliability. Yes?
Is a 10 year labor warranty warranted?
The lifetime replacement warranty on the Amana seems unusual in this field. Any thoughts or additional questions I should ask the installers?
For an additional fee the AMANA system could be instead a 4 ton two stage 16 SEER A/C Amana (ASX160481 with CAPF486061TXU coil). This was the original suggestion by the AMANA installer. But all of the other installers suggested a 15 SEER single stage condensing system because the 4 ton system was oversizing and an unnecessary additional cost. Who is correct?