Help - Need Advise
My Payne packaged heat pump is about to expire. To avoid a breakdown in the Arizona summer, I have gotten several estimates to replace the system. My home is a 1,500 square foot single floor patio home built in 1973, common walls with my neighbors both sides, multiple windows, including sliding glass doors on the east and west facing walls, 2 interior atriums, a flat roof with the heat pump system on the roof. The duct work is in the ceiling and I have been told is small but not worth the cost to replace due to tearing out the ceiling.
The current Payne heat pump is 3.5 tons, PH1ZO24-060. After reading the forum and researching, I think I want to the get a Carrier but am not sure which system is best for my house:
1)Carrier dealer - Model 50VTA042, 3.5 ton package heat pump, 14 SEER, multi speed blower, single stage compressor. Quote after rebate $5,485.
2)Carrier dealer - Model 50XTA 42TP, 3.5 ton package heat pump, 15 SEER, variable speed blower, two stage compressor. Quote after rebate $7,555
I also got two other quotes, one a Night and Day system from the company who services my Payne system but a 14.25 SEER was $8,762. The other was from Sears Ã¯Â¿Â½Ã¯Â¿Â½" no model number but it was Carrier Infinity, 15 SEER, $12,921 so think it may be the 50XTA model. The Sears salesman said with measurements and windows, I needed a 5 ton system but this sounds too big to me. The quote was 3.5 tons because I told him I was not interested in a 5 ton. The Carrier dealer said the 5 ton is too big and it could cause problems my duct work.
I know this is not a lot of information (missing size of ducts, returns, exchanges, airflow) but based on this, do you think that the two stage system with variable speed blower is worth the extra money compared to the single stage with multi speed blower? The system must work 9-10 months out of the year so I want to make the right investment.
Any advise will be appreciated.