HVAC (에어컨과 히터) 새로 교체하기전 고수님들의 의견을 듣고 싶습니다.

에어컨이 작동하지 않아 전체 시스템을 갈야아할거 같은데 몇가지 proposal을 받고 결정하기 전에 고수님들의 의견을 듣고 싶습니다.  

1-3번중 어떤 결정이 가장 좋을까요?

그리고 현재 집은 Lennox인데 에어컨 브랜드이 tier가 어떻게 되는지 궁금합니다. Lennox vs American Standard vs Goodman vs Ruud vs Bryant

1. Costco 업체 (리뷰  4.9/5)

Lennox, 5ton, 16 SEER, two stages, 3년 labor 포함, 1주일내 설치 가능

Total: $11,700 ($14,150 - costco 10% - costco card 2% - 전기회사 리페이트 $280)

Proposal 3 - Split Attic Gas: (Option A): Replace existing heating and cooling system with new equipment specified above.

Installation includes: • Removal and disposal of old equipment from property • Recover existing refrigerant • Install a new condenser

and attach to existing line set • New furnace • New evaporator coil • New secondary drain pan with ceiling saver kit • Flush existing

PVC condensate drain line • New return and supply plenums • Seal all duct connections at plenums to minimize possible air loss and

reduce dust • New fused electrical disconnect box & electrical whip at condenser • New gas flex connector to furnace • Replace (1)

existing return air grille with new bar-type filter grille, • Clean up of job site upon completion, and • All checked boxes below.

• If drywall repair is required after installation, painting is excluded unless otherwise specified. If painting is included, Collins Comfort

Masters cannot guarantee paint match.

2. Online (www.newacunit.com/) 업체 (로컬 업자가 싸게하고 싶으면 여기서 하라고 소개)

Goodman, 5ton, 16 SEER, two stages, manufacturer warranty + 1 year labor / 2 year workmanship warranty,

기본적으로 furnace, evaporator coil, condensor만 설치하는거 포함, 바로 설치는 안될듯...

extra는 recommended 와 required로 나뉘는데 recommend는 안해도 상관없고 required는 하고 싶지 않으면 contractor가 왔을때 전체 주문을 취소할 수 있다고 하네요....

Total: $7600 + extra (?) 

3. Local 업체 1 (리뷰 4.4/5)

option1 - Total: $11,590 (American Standard, 5ton, 16 SEER, 2 stage)

option2 - Total: $13,322 (Bryant, 5ton, 16 SEER, 2 stage)

option3 - Total: 12,879 (Ruud, 5ton, 16 SEER,  2 tage)

Professional installation to include: Flushing of existing refrigeration lines with nitrogen, service disconnect, armaflex, cladlite

pad, hang furnace and coil in attic, enlarge both supply and return plenums, add adjustable dampers, drain system,

secondary drain pan with emergency shut off, gas flex line, flue kit, flip switch, carbon monoxide detector, R410A

refrigerant, Honeywell programmable thermostat, bar style return grill, all electrical and ductwork reconnection, check

ductwork , static pressure and airflow, run a refrigeration vacuum on new system, mechanical start up in heating and cooling

with removal and proper disposal of old equipment and post installation quality inspection.

Warranty: 10 years on compressor and parts with