This article seems to be mainly about larger air conditioning systems, whole house units or industrial ones, which is great, higher efficiency would be useful t

This article seems to be mainly about larger air conditioning systems, whole house units or industrial ones, which is great, higher efficiency would be useful there. I'd also like to see some improvements in low cost window air conditioners. The only brand I know of that has tried to improve efficiency is Midea which sells inverter based air conditioners. It would be nice if they added a HEPA air filter, a heat exchanger to bring in fresh air with little energy loss, and if they kept mold out instead of encouraging it. We know air quality has a big impact on life and filtered air can reduce airborne diseases and reduce mold, allergens, and the need to dust off everything periodically. There has been little change in window air conditioners for decades, seems like an area that is ripe for disruption, and with efficiency improvements they would help reduce load on the grid and cost less to run. Also there is no reason a window unit can not be a heat pump and do efficient heating as well as cooling.