There is a chemical poison fly bait. In the US I bought it at an agricultural supply. Worked best placed on some cooked fish remains. It was great. Just need to be sure and place it where pets cannot find it. Golden Malrin was the brand. It's sold on ebay. It eliminated the flies.
This can't be too good for the environment here in DR. Can it be confiscated at the airport?
Turn your A/C down to 71. All flying insects will be gone.
You've never met San Pedro de Macoris or San Juan de la Maguana mosquitos. They would laugh at such a statement.
Ha ha, try even lower .I'm telling you it works. Even when I want my chica to leave turning the A/C way down will chase her out. She will call me ice man and leave.
We set ours to 19 C and it drives the mosquitos out. It works.
We have a guy tomorrow afternoon ( from Bahia Principe hotel) a fumigar the whole house
. Not for mosquitos but a tick problem we had. Must be very effective, even mice don't survive it.