Hi I’m bobby. I’m having some issues with my ac. I have an American standard fuernace cub100a936c4 and ac unit 2q7b0030a1000aa. The unit runs all day this was install in Chicago area on a raised ranch brick with no insulation instilled in the walls it’s doubled bricked. I have 3 registers in the living room no returns with thermostat in living room and have big picture windows. 1 retune in the hall and 1 retune and register is all 3 bed rooms and 2 register in bathroom. 2 register in the kitchen. 5 register in the basement. Duck work size is 20x8 for feed and supply tapering down to smaller size running the length of the house. No attic fan just vents not sure how many at this time. The system never works right from install. I had the first installer come back to try to fix it but nothing at first I only had a small 16x16 in wall retune in the hall on the bottom wall, then installed on at the top of the wall for more air cfm. Then two in the basement 6" ducks. It helped only 5% from how it was. I then called a different installer and he told me that the ducks are under side, and need more air to the retune. he told me the he can fix it by putting in a 18 inch round returnee in the hall and feed it from the attic in to the bedroom closet and down throw the floor joists. He said it would fix it 150% but it did not. That did help maybe 25% but I can never get the ac to stop and get to 76 deg that I set on the thermostat.
What is wrong? What can I do to make the ac work right and cool the house it’s been like this for 6yrs?
The house is 105x25. That’s 2625sft.
The ac unit is 2.5 ton furnace is 100,000 buts’
What type of ton ac unit should I have? Should I install an attic fan, and more insulation in the attic I think it has 6 inches of lose fill cellos Thank you all who respond to my post sorry for the long post