Have a heat wave in SLO, so bought a 12,000 btu window AC. My pad:

1 bedroom

downtown SLO, so factor downtown, but, am on the hill facing the coastal valley

approx 700 sq feet; upstairs unit (1950s), with only someone below us, all four walls are free. Windows are a year old, double paned. Admittedly, the insulation is not much. But, I have had this thing running on high at the lowest temp since about 10 am this morning.

Are window units weak? It is a sharp.

Any ideas? Cuz it is not that cool in here.