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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.

If you have a fresh air intake as part of your HVAC system, the interior vents should be near your furnace or other gas appliances inside your home. From the outside of your property, your HVAC fresh air intake location is usually near the ground (although it may also be higher up, like on the roof or attic).

The best location for return air vents is strategic to ensure balanced airflow and temperature control. In most homes, placing them in central, open areas like hallways or large living spaces is most effective. Ideally, they should be located across from a supply vent. Climate is also a factor: in warm climates, place vents high on the walls to help remove rising hot air, while in colder climates, lower placement is better. It's also important to ensure that vents placed low on walls are not blocked by furniture. The optimal placement ultimately depends on your HVAC system's design, your home's specific heating and cooling needs, and the accessibility of the ductwork.

Condensation forms when warmer, outside air combines with cooler air in your ductwork. This can happen when there are leaks in your air ducts, your HVAC system has a dirty air filter, or there’s a lack of insulation around the ducts. To prevent it from happening, replace your HVAC filters as directed. Also, once every five years, hire a local air duct cleaner to clean and inspect them.