I thought I had my beach house fairly well-sealed, but I found out the strenuous way Last year that my assumptions were gravely mistaken.  Although I had done a moderately fine job with the weather stripping on all of my windows & doors, I forgot to inspect my air intake vents on the outside of my house.  These vents pull in fresh air from outdoors to circulate with the Heating, Ventilation & A/C cycled air indoors. In several cases this can lead to better air quality inside your beach house overall.  Unfortunately, these areas are also prime environments for bees & wasps looking for shelter from the elements. One day I was in my bathroom when my heat kicked on. Within minutes several wasps started flying out of my air vent in the ceiling.  I was both baffled & freaked out by the event. I had no plan how extensive the nest was, or if there was even a nest at all, so I called a local Heating, Ventilation & A/C corporation. Unfortunately, there was disfigure to the filter on the fresh air intake, so bees & debris & dirt were getting pull into my central system.  My Heating, Ventilation & A/C serviceman replaced the filter & repaired the disfigure to the intake inlet to make sure nothing as big as a bee or wasp could make their way into my beach house care about this again. Once the tech located the wasp nest, he used an eco-friendly insect repellent to get the wasps out so he could manually remove the nest.  It’s essential to steer clear of any harmful pesticides or insecticides when you’re dealing with pests in your air system. Those chemicals will accumulate up there & you’ll never be able to fully clean your air system, consistently breathing small amounts of toxic fumes every single day. Now that my air intake inlet is repaired, I don’t have to fear bees flying out of my vents at random moments of the day.