Mama and Daddy had a Sears Coldspot window unit A/C they bought in 59 when they bought the house we grew up in. It was a "3 ton" window unit. It cooled the whole house without breakin a sweat and even cycled the compressor on the hottest of days
I just bought an old farm house. Pretty nice house, but I’m doing some remodeling to bring it up to date. Central heat, but no air. There’s a big Montgomery Ward unit in the living room wall. Works like new, and cools the whole house. Plan on upgrading the heat and air in the spring.
