I use the cheapest "angel hair" type filters based on the advice of several people on on IRV2 and others with esperience on the basement air system. Several people that have reported poor cooling in hot weather have improved their cooling by reducing the restriction in the system. I change the filters monthly in the summer or in Florida in the winter.
I pulled my A/C unit last fall to clean it as my coach is 7 years old (56,000 miles) and we use the basement air with the generator on the road. It was not nearly as dirty as I expected it to be. Granted it was dirty, but I expected much worse. A friend and I did both ours at the same time and I did find that mine had more oily dirt and his was more dry or dusty dirt. He does not use his on the road so I attributed the condition of mine to road grime. At any rate, anything you can do to reduce resistance will improve cooling, especially when it's as hot as it is now.
Good luck,
Dave
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2004 37B Adventurer, 8.1 WH, Ultrapower, DIY CAI, Henderson Track Bar, Tru Center, Koni FSD's, Roadmaster Even Brake, Scan Guage II, 180 Thermostat,
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