Would a "swamp cooler" for the house be acceptable? Although I'm unsure if you can get them any more as they are a bit of a water waster. They also can be a source of water-friendly allergens.
I cannot, however, guarantee that one would be cheaper or easier to install than the RV unit for the trailer.
In Albuquerque, at least prior to 1989, most houses and many businesses only had evaporative coolers and they worked pretty well except at the peak of the monsoon humidity. Even where my parent's house sits less than a mile from the river, half the house has been cooled by a swamp cooler since the early 1980's.
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I cannot, however, guarantee that one would be cheaper or easier to install than the RV unit for the trailer.
In Albuquerque, at least prior to 1989, most houses and many businesses only had evaporative coolers and they worked pretty well except at the peak of the monsoon humidity. Even where my parent's house sits less than a mile from the river, half the house has been cooled by a swamp cooler since the early 1980's.