[pecmsg]

Old rule of thumb.

But it must be true.......it’s on the web!

 

[pecmsg]

Thanks, I think I understand what you're saying. But the guy who wrote this blog seems to be saying that if the temp gets ABOVE 95 outside and you want to maintain 75 in your house there's nothing that can be done. He says it like it has nothing to do with design temps, proper manual J and manual S, insulation, etc. Like it is a physical limitation built into the equipment itself. I, on the other hand, am fairly convinced that a properly sized system in a reasonably well insulated home can easily maintain a design temp of 75 even in 100+ or 105+ temps outside. But maybe I'm wrong, and that's why I ask the pro's!

Ask that expert what he does for 100% outside air