We have a 30 year old Ruud 3-ton A/C unit for 1700 sq ft. 3 floor split level house. It still cools the house but only to 77 degrees. if I set it any lower the unit will run all day (it still does that when the temp goes above 90). It used to cool better years ago but that was also years ago so I am not sure how well is well. I had a tech visit a 3 years ago and he said the air handler was blowing something like 48 degrees. I'm sure a new unit will help but that cold of a temp had me thinking if the issue was duct related. I also have issues with my windows in the living/dining room. They let so much heat in during the morning and the gaskets have failed (condensation in between) that we are looking to replace them shortly.
I had a few companies out here, some say to replace the main duct in out attic with a larger one, others say to replace the main as well as larger ducts to each room (currently 6") while others say just to add one more duct to the living/dining room. I don't know who to trust with this. I also do clean the coils yearly and replace the filter every 3 months.
Quotes for 13 seer Bryant and Carrier units (as well as some duct work)
Quote 1 Air Handler Carrier Performance FB4CNF036L Single Speed Air Handler to be installed in the attic. New air handler will be hung from the rafters and include new include new drain pan with emergency float switch, new properly pitched drain lines $6200 Ductwork Install all new enlarged custom fabricated and sealed and insulated supply trunk, New R-8 insulated and properly sized, flexible duct feeds to existing ceiling boots. Add new supply to first floor Living Room. $2700 Total $8900
Quote 2 Condenser Carrier Comfort 24ABC636 Single Stage Air Conditioner with condenser pad (side of the house, in existing location as discussed. Bryant 36,000 BTU 13+ SEER a/c unit Bryant 36,000 BTU 13+ SEER fan coil unit Supply and install only new ductwork will upsized ceiling vents and larger ducts for the rooms. Cost $4,300.00 Relocate return from inside the closet to outside of the closet. Cost $300.00 Total 9,700
Quote 3 $12,700 Carrier 24A BC636 condensing unit set on 3" concrete slab at right side of house and connected to a Carrier FX4DNF037 fan coil in attic with custom copper piping. (34,200)
I'm going to bring in additional people to see but do these quotes seem a bit high? There is one large metal duct coming off of the air handler that feeds flex piping to the 2nd floor. The first floor has a flex duct feeding to a larger metal duct which runs down to the 1st floor, and the 2rd floor has flex duct from the main duct out of the air handler.
Any help would be appreciated.
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