Supply Ventilation in an Apartment: Options, Pros and Cons

Modern apartments are often sealed for energy efficiency, but that same airtightness can trap CO₂, humidity, odors, and pollutants. Supply ventilation brings controlled outdoor air into your home, helping stabilize indoor air quality—an especially practical upgrade for apartment living in Glendale, where heat, traffic, and seasonal air issues can affect comfort. The simplest option is a passive air inlet (wall or window vent). It lets fresh air enter naturally when there is a pressure difference. Pros: low cost, quiet, minimal maintenance. Cons: weak airflow in calm weather, limited filtration, and possible drafts or street noise. A step up is a compact supply fan (often with a filter and basic controls). Pros: predictable airflow, better comfort, and the ability to use higher-grade filters for dust and allergens. Cons: requires power, adds some noise, and needs professional planning to avoid sending air into areas that can’t exhaust properly. The most advanced choice is a balanced system such as an HRV/ERV (heat/energy recovery ventilator). It supplies and exhausts air simultaneously and can recover heat (and sometimes moisture), reducing energy loss. Pros: stable air exchange, strong filtration options, fewer drafts, improved humidity control. Cons: higher upfront cost, more complex installation, and the need for space for ducts or a compact distribution setup. When choosing, consider your apartment size, existing exhaust (bath/kitchen), noise limits, filter availability, and HOA/building rules. A properly sized supply system paired with reliable exhaust is the key to fresh air without comfort or energy surprises.