Heating, ventilation, and air conditioning (HVAC) systems are necessary to refresh the air inside rooms. This helps balance temperatures throughout the entire building, and maintains air quality in various rooms. Most buildings are constructed with ducts which run throughout the entire structure. Vents release airflow from the ducts and permit air to be moved from the rooms to improve circulation.

In some cases, the solenoid may be fitted with a mains voltage coil, but most have low-voltage coils, typically rated between 12 and 24 volts, many fed by solar charged batteries. Where the vents are used as entry or exit points in rooms, the solenoid is usually mounted on the inside of the vent assembly where it is not visible.

 

In moderate climates, displacement ventilation can be supplied with outside air, requiring no energy expenditure for modifying the temperature, only for air movement. The temperature in a room cooled with displacement ventilation is lowest near the floor and hotter near the ceiling, as opposed to the room cooled with a mixed-flow system where the temperature is more consistent throughout. This distinction allows for the use of fresh air for a longer portion of the year with a displacement system, a process known as free cooling. In hotter or more humid climates or seasons where air conditioning is necessary, cooled air is supplied instead of fresh air.

To choose the best whole house air filtration, it is important to determine what your overall needs are. This will allow you to determine how sophisticated a system you should purchase. For example, those with asthma, lung disease, or other conditions may benefit from a heavy duty hospital grade filtration system. Those with no preexisting conditions on the other hand, may do well with a smaller system bought from a department store.

HEPA filters are capable of capturing smaller particles of allergens and bacteria than more conventional filters. This makes them more suitable not only for patients with lung conditions, but for other ill people who can’t be exposed to high levels of bacteria and toxins.

The cost of buying a whole house air filtration unit varies. Small units capable of filtering a smaller home or trailer can be bought in department stores and online retailers, while hospital grade units may have to be purchased through specialized retailers. An HVAC professional will most likely have to install both hospital grade units being run through your home’s ductwork, as well as more conventional built in units.