How do you beat the heat?

@lpthehermit Wow never heard of r60 insulation products - here the recommended r values for nsw east coast living are r2.5 in walls and r 5.0 or 6.0 in the roof. My house I know for a fact has zero insulation in the walls, and while it does have batts in the roof I have no idea what their rating is. It's a 1950's/60's timber frame, tile roof, single story, fibro clad building made as a government housing dept home (but was sold into private ownership in the early 2000's). I think the existing defective not repairable split-system AC probably dates from around then.

@zonavar68 Current building code is based on climate location. Floors R30, Walls R21, Ceiling R38. Code allows for adjustments as long as the whole building envelope achieves required heat loss prevention. Ceilings are worst for heat loss. Adding extra insulation raises R value. Blow-in extra thickness or stack 2 R30 batts achieves R60

@friendlykinkster Code is a minimum.

@SomeMichGuy yes. and adding insulation raises R value.

@friendlykinkster Yes

And some states like to block better codes...

@SomeMichGuy Washington state has their own energy code put together by state university. Every thing must meet or exceed minimum requirements

@friendlykinkster


...yes. Code is a minimum.