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Yes, scorpions can enter a home through AC vents, especially if the system is not well-sealed. As excellent climbers, they can scale a home's exterior and squeeze through gaps as small as 1/16 of an inch. Scorpions are often attracted to the moisture around air conditioning ducts or seek cooler areas during hot weather, using vents as a pathway inside. They may slip through small openings where the duct meets the vent cover and travel within walls before emerging. To prevent this, inspect your vents, seal any gaps, and consider installing fine mesh screens.

Forced-air heating systems should be professionally inspected and maintained at least once per year to ensure they are operating safely and efficiently. During this visit, a technician will check all key components of the HVAC system, including the furnace or heat pump, air conditioner, and ductwork. On average, a professional HVAC inspection costs around $300. Proper maintenance can reduce health risks and prolong the system's lifespan. In between professional inspections, you should also perform basic maintenance, such as changing your air filters and cleaning dust from around the vents.

The number of return air vents a house should have depends on its overall square footage. You'll need one supply vent and one return vent for every 100 to 150 square feet of living space. This means that, ideally, there should be at least one return air vent in every room. However, if the room is 100 square feet or larger, it's better to have two or three. A 2,000-square-foot home should have between 13 and 20 return air vents, in total.

According to HomeAdvisor, cleaning AC coils costs most people $100 to $400. Cleaning costs less when you wrap it into your annual service visit or have your coils cleaned at the same time as your ducts. Duct cleaning, a service that includes cleaning the evaporator coil located in your indoor unit, costs $250 to $500.