I'm in Phoenix, AZ - and here we absolutely must apply pesticides year round.
We buy the exact same chemicals the exterminators use, on Amazon; and we bought a small sprayer on Amazon. It will maybe cost you $50 for what you need - and that will last you for at least 2 years. Whereas we used to pay $50 a MONTH for someone else to do it.
We spray the outside of our house every 3mths. You do not need to spray every month at all.
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