Currently have a split level with 600 sq ft each with 1 turbine and 1 louvred vent on low side and 2 louvred vents on high side. ACU operates excessively. Look at intake, insulation, new ACU, ridge vent but feel attic air not moving out fast enough is the problem. This could be restricted intake or vent.
- Installed approx R30 to R50 additional blown fibreglass insulation 4 yrs ago. Not much benefit in hot summer with AC on all day every day in hot summer rising above room temp. (12~18" in addition to existing R30?)
- noticed previous renovators blocked off soffits over garage , so I tore out alum. slit soffits and plywood and put in mosquito netting for soffit stapled in place over frame inserts.
- Upgraded to New 5 ton ACU installed 2 years has improved home cooling but still can run excessive times, often all day but acceptable temp (25'C)
- roof is getting old on solar side and getting it replaced soon and there are some minor rain leaks with ceiling very slight damage in 2 spots.
What I want to do is reduce the ceiling air temp from roof heat penetration so AC has less work to do. Roofer is planning to use large square tall vents like Japanese pagoda but not curved. Looks OK, but HOW much better are they? if any. Often the turbine is not moving in no wind days.
Should I invest in motor-driven turbine? or what do you suggest?
With 600 sqft of sun exposure I estimate 60kW of solar heat with R50 but it still seems like a thermal air flow problem.