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You should never block both the top and bottom of your chimney. Proper airflow is essential because the temperature inside the chimney will still fluctuate as your house warms and cools. Moisture can build up without ventilation, leading to dampness in your walls over time. Blocking the top prevents debris and animals from entering, but the chimney still needs air circulation to avoid condensation issues. Allowing the chimney to breathe maintains the health of your home and prevents long-term damage.

Adult fleas can live from a few days to about two weeks without a host. If pets are not available, fleas may feed on rodents or people. While adult fleas need a blood source to survive, flea pupae can lie dormant for up to a year in optimal conditions. Therefore, cleaning and treating the infested area is essential to prevent pupae from surviving and hatching later.

If squirrels set up a home in your attic, they can cause considerable damage. It’s not uncommon for them to chew holes in your roof, siding, or joists, and they can eat through electrical wiring. They might also travel to other parts of your home or into your wall cavities. Not to mention all that bacteria-filled feces and urine they spread around. 

If the nest is on or in your home, you should have an exterminator remove it. However, if the wasp nest is in an area of your yard that you don't frequent, you can leave it alone as long as the wasps don’t bother your household members. Wasps are very active during the summer months, but they will vacate in the fall and not return until the following year. So, if it's safe to do so, you can leave it, but if it poses a threat of being stung because it's in an area that you use frequently, consider having it removed.