I'm new here although I have been an avid reader for years.
I need to determine how to proceed with an inefficient a/c situation.
Top floor loft condo. 1650 sq. feet. open concept. double pane builders windows. Located in Baltimore, MD.
Air handler located in exterior balcony closet. Thru-wall Aerosys 3 ton condenser. 4 years old. All ductwork is located in the attic.
1 central return duct in the living room which is fabricated from chip board inside a drywall partition with the return grill at floor level. The ceiling in the living room is 18 feet high and is open to a second level loft.
There is a sheet metal trunk line in the attic that runs from an upflow air handler for approximately 10 feet and then it transitions to a flex duct which turns 90 degrees up to the roof peak and turns 90 degrees to supply flex duct for the MBR, Kitchen, Bath and Loft.
When outside temperature climbs past 85 degrees, the a/c can not maintain 74 t stat setting. When it gets to the mid to upper 90's, it can not maintain 80.
Purchased condo new in 2004. it had a 2-1/2 ton a/c unit. In 2005 the builder said they were going to install an attic fan. Then they found out they could not because of the HOA rules. So they replaced the a/c with a 3 ton unit. No help.
My electric bills are running extremely high. The a/c does not cycle off until late night every night.
I just discovered that there are identical condos being built and the loft units now have 2 systems! I am not allowed to put in a second system because of the HOA rules on exterior alterations.
Any thoughts would be greatly appreciated