Thanks in advance
1660 sf house
50yr old construction (original r-values, minimal attic insul., original windows)
2nd year in house.
Last summer 10+year old AC unit ran mostly non-stop and couldn't get below 80 degrees when it was 100+ outside (which is typical for most of July and August)
Technician (from a reputable company) diagnosed compressor was old and failing= couldn't keep up. Recommended solution: replace air conditioner (and furnace), and ducts, and insulate ducts, and insulate attic. Couldn't afford all of that so just replaced Air conditioner and furnace in the early spring (inside and outside unit Lennox XC14 and Lennox CB30B34 X7001). Now our Avg. outside temp for June was 100 degrees (not looking forward to record breaking July and August) and inside temp still can't get below 79~80 degrees.
The company is reporting a 24 degree temp drop across the system which is what they supposedly design to. Is this what I am stuck with unless I spend more money to insulate the ducts, put in a radient barrier, ventilate and insulate my attic? I could have spent the money on doing all that instead of on the new unit if the inside temp is the same right? And when it gets to 110~112 degrees, is my best hope 90 degrees inside? The technician knew I wasn't getting any work done on the ducts/ insulation- Is there reasonable cause to think the unit may be undersized?
FYI, I have a very pregnant wife and toddler at home and we would like it to be 75 degrees.