danemayer
Well-known member
If you've operated the A/C for 4 years without filters, as said earlier, your unit on the roof is probably clogged with dirt. You'll need to carefully remove the shroud (never know if wasps have built a nest inside) and clean the unit. The fins are easily bent so clean them gently.Yes, and never have seen any filters.
And of course, you need filters on the return vents.